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Domestic Ventilation Compliance Guide

2010 Edition(with 2011 amendments)

O N L I N E V E R S I O N

O N L I N E V E R S I O NO N L I N E V E R S I O N

July 2011Department for Communities and Local Government

Domestic Ventilation Compliance Guide2010 Edition



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Contents | 3

Contents

Section 1 Introduction 5

1.1 Status of guide 5

1.2 Requirements on air fl ow testing, commissioning and information provision 6

1.3 How to use this guide 7

1.4 Key terms 8

Section 2 Natural ventilation and intermittent extract systems 9

2.1 System 1 – Background ventilators and intermittent extract fans 9

2.2 System 2 – Passive stack ventilation 9

Section 3 Continuous mechanical ventilation systems 24

3.1 System 3 – Continuous mechanical extract: centralised and de-centralised 24

3.2 System 4 – Continuous mechanical balanced systems with heat recovery: centralised and single room 24

Section 4 System completion and handover 53

4.1 Documentation to be handed over to the end user 53

Section 5 Inspection checklist and air fl ow measurement test sheet 55

5.1 Checking design against measured air fl ow rates 55

5.2 Instrument calibration 56

5.3 Demonstrating compliance 56

Part 1 – System details and declarations 57

Part 2a – Installation details 58

Part 2b – Inspection of installation 59

Part 3 – Air fl ow measurement test and commissioning details 61



Section 1 Introduction | 5

Section 1

Introduction

This guide provides detailed guidance to help persons comply with requirements in building regulations for installation, inspection, testing, commissioning and provision of information when installing fi xed ventilation systems in new and existing dwellings. The aim is to ensure the provision of adequate ventilation while minimising energy use and environmental problems such as noise and thermal discomfort.

It is important to note that the guide covers a range of frequently occurring situations but it is not exhaustive and alternative means of achieving compliance with the ventilation requirements in the Building Regulations may be possible.

1.1 Status of guide

Building regulations contain functional requirements, such as requirements that buildings must be structurally stable, must be constructed and fi tted out to ensure reasonable levels of fi re protection, and must be reasonably energy effi cient. These functional requirements are often drafted in broad terms, and so it may not always be immediately clear to a person carrying out building work how to comply with the relevant requirements. Consequently documents are often issued by the government department responsible for building regulations which provide practical guidance on ways of complying with specifi c aspects of building regulations in some of the more common building situations. In England and Wales, these documents are called Approved Documents.

Approved Documents are intended to provide practical guidance but they are not intended to be comprehensive. Consequently there may be references in Approved Documents to other documents which will provide more detailed information and assistance on parts of the guidance. This guide is one of those documents. It provides additional detail in relation to the guidance about compliance with the requirements for installation, inspection, testing, commissioning and provision of information in Approved Documents F, L1A and L1B which apply when installing fi xed ventilation systems in new and existing dwellings.



6 | Domestic Ventilation Compliance Guide: 2010 Edition

It is important to note that following the guidance in an Approved Document or any guidance referred to by that document does not guarantee compliance with building regulations. If you follow relevant guidance in an Approved Document and in any document referred to which provides additional advice or information to help you follow that guidance (such as this guide), there is a legal presumption that you have complied with building regulations. However, in every case it is for the building control body, whether a private sector approved inspector or the local authority, to decide whether work complies with building regulations. So, you should always check with the building control body before you start work what they consider it is necessary for you to do to comply with building regulations.

1.2 Requirements on air fl ow testing, commissioning and information provision

In England and Wales, requirements for ventilation and energy effi ciency are contained in Part F, Ventilation, and Part L, Conservation of fuel and power, of Schedule 1 to the Building Regulations. This guide provides appropriate guidance for the four types of ventilation system discussed in detail in Approved Document F. It is referenced by Approved Document F (ADF), Approved Document L1A (ADL1A), and Approved Document L1B (ADL1B) as providing guidance on meeting those requirements for ventilation systems.

Specifi c statutory requirements in the Building Regulations for England and Wales which this guide addresses are:

• The requirement to commission mechanical ventilation systems (where they can be tested and adjusted) in accordance with an approved procedure, and to provide a notice confi rming that commissioning has been carried out to the building control body not later than fi ve days after the work has been completed where a person has had to submit a building notice or full plans or, in other cases, not later than 30 days after the completion of work.

• For mechanical ventilation systems in new dwellings only, the requirement to measure air fl ow rates in accordance with an approved procedure, and to provide a notice recording the results and the data on which they are based in an approved manner to the building control body not later than fi ve days after the fi nal test is carried out.

• The requirement to provide suffi cient information about the ventilation system and its maintenance requirements to owners or occupiers so that the ventilation system can be operated to provide adequate air fl ow. This guide contains recommendations on the range of information that could be given to dwelling owners on completion to satisfy this requirement.



Section 1 Introduction | 7

The approved procedures for commissioning mechanical ventilation systems in dwellings and air fl ow testing of such systems in new dwellings are set out in Tables 2, 6 and 8 according to which ventilation system has been adopted.

The manner in which the results of air fl ow testing and the data on which they are based are to be recorded and given to the building control body is given in Part 3 of Section 5 of this document. A downloadable copy of this form is available at www.planningportal.gov.uk/approveddocuments > Part F (Ventilation) > Associated documents, for the use of those carrying out the air fl ow testing.

In addition to specifying how the above statutory requirements in the Building Regulations should be met, this guide also contains recommendations for an inspection checklist and for recording the equivalent area of background ventilators.

The inspection checklist and air fl ow measurement test and commissioning sheet in Section 5 should be completed by installers and test and commissioning engineers, and should form part of the information pack given to dwelling owners to satisfy the information requirement.

1.3 How to use this guide

The guide refers to Systems 1 to 4 as specifi ed in Approved Document F.

Section 2 provides guidance on installation, inspection and testing of natural ventilation and intermittent extract systems; and Section 3 provides guidance on installation, inspection, testing and commissioning of continuous mechanical ventilation systems.

The testing and commissioning procedures set out in this guide are the approved methods by which a system must be checked and assessed before handover to the end user. For mechanical ventilation (both intermittent and continuous), air fl ow measurement tests are included as part of the commissioning process. For natural ventilation openings, the recommendation is to carry out a visual inspection and record the equivalent area.

Supplementary information appears in some places in the guide in italic font with a grey background. It is intended to assist understanding of the guidance or to direct readers to sources of additional information, but is not part of the guidance. In some cases there are links to best practice guidance that goes beyond the recommended minimum requirements.

BS EN 14134: 2004 Ventilation for buildings – Performance testing and installation checks of residential ventilation systems may be referred to for further guidance on installation, inspection, testing and commissioning procedures.




Section 4 details the information that it is recommended should be left with the building owner on completion of the installation of the system. This information is to aid the user to correctly operate and maintain the system.

Section 5 contains in Part 1 a form for recording details of the installation; in Part 2a an installation checklist; in Part 2b a form for recording the results of a visual inspection of the installation; and in Part 3 the air fl ow measurement test and commissioning sheet to be given to the building control body.

1.4 Key terms

The following key terms where used in this guide are shown in bold italic font. For other terms, reference should be made to Approved Document F.

Background ventilator is a small ventilation opening designed to provide controllable whole building ventilation.

BCB or building control body is a local authority or an approved inspector.

Continuous mechanical extract ventilation (MEV) is a ventilation system comprising a central ducted continuously running extract fan (or a set of local continuously running extract fans in the wet rooms for de-centralised systems), air being supplied via background ventilators into the habitable rooms.

Continuous mechanical balanced ventilation with heat recovery (MVHR) is a ventilation system that comprises central ducted supply and extract fans, air being supplied into the habitable rooms via a heat recovery unit.

Equivalent area is a measure of the aerodynamic performance of a ventilator. It is the area of a sharp-edged circular orifi ce which air would pass through at the same volume fl ow rate, under an identical applied pressure difference, as the opening under consideration.

Free area is the geometric open area of a ventilator or terminal.

Intermittent extract fan is a mechanical ventilator that does not run all the time, usually only running when there is a particular need to remove pollutants or water vapour (e.g. during cooking or bathing). Intermittent operation may be under either manual control or automatic control.

Passive stack ventilation (PSV) is a ventilation system using ducts from terminals in the ceilings of rooms to terminals on the roof that extract air to outside by a combination of the natural stack effect and the pressure effects of wind passing over the roof of the building.

Single room heat recovery ventilator (SRHRV) is a ventilation system comprising local continuously running balanced supply and extract fans in a single room.



Section 2 Natural ventilation and intermittent extract systems | 9

Section 2

Natural ventilation and intermittent extract systems

2.1 System 1 – Background ventilators and intermittent extract fans

The information provided in Tables 1 and 2 gives guidance on good installation practice and on procedures for the inspection and air fl ow measurement testing of systems comprising background ventilators and intermittent extract fans (including cooker hoods) for dwellings. The relevant design guidance is given in ADF, in particular Table 5.2a.

2.2 System 2 – Passive stack ventilation

The information provided in Tables 3 and 4 gives guidance on good installation practice and the procedures for the inspection of passive stack systems for dwellings. The relevant design guidance is given in ADF, in particular Table 5.2b.

Note:

If intermittent extract fans are installed in dwellings where the ventilation system follows System 2, air fl ow measurement testing should be carried out and recorded as for System 1.




Tab

le 1

: Sys

tem

1 in

stal

lati

on

gu

idel

ines

Inst

alla

tio

n c

lau

ses

Sup

ple

men

tary

info

rmat

ion

1.0

Inte

rmit

ten

t ex

trac

t fan

s (in

clu

din

g

coo

ker h

oo

ds)

Man

ufa

ctu

rer’s

det

ails

an

d s

pec

ifi c

inst

ruct

ion

sa.

Th

e in

form

atio

n pr

ovid

ed in

this

Tabl

e se

ts o

ut th

e m

inim

um re

com

men

ded

proc

edur

es fo

r typ

ical

Sys

tem

1 in

stal

latio

ns.

b.

For f

urth

er p

rodu

ct-s

peci

fi c in

form

atio

n, re

fer t

o th

e m

anuf

actu

rer’s

in

stal

latio

n in

stru

ctio

ns.

Prep

arat

ion

a.

Ensu

re th

e fi n

al lo

catio

n of

equ

ipm

ent o

ffer

s suf

fi cie

nt sp

ace

to a

llow

acc

ess

for m

aint

enan

ce.

b.

For t

hrou

gh-w

all u

nits

, cor

e a

hole

of a

suita

ble

dim

ensi

on th

roug

h th

e fa

bric

of t

he b

uild

ing

for t

he in

stal

latio

n of

the

duct

. The

hol

e sh

ould

hav

e a

slig

ht d

ownw

ard

angl

e to

war

ds th

e ou

tsid

e to

pre

vent

wat

er in

gres

s.c.

Fo

r cei

ling

mou

nted

fans

/ter

min

als,

the

hole

s sho

uld

be c

ut to

the

min

imum

re

quire

d si

ze su

ch th

at th

e fa

n/gr

ille

spig

ot fi

ts sn

ugly

into

the

hole

.d.

W

here

duc

twor

k pe

netr

ates

a b

uild

ing’

s air

barr

ier,

the

cont

inui

ty o

f the

ba

rrie

r mus

t be

mai

ntai

ned.

The

nat

ure

of th

e ba

rrie

r and

eas

e of

ach

ievi

ng

an e

ffec

tive

seal

shou

ld b

e co

nsid

ered

bef

ore

hole

s are

dril

led.

e.

It is

impo

rtan

t to

cons

ider

the

plan

ning

and

inst

alla

tion

of d

uctw

ork

in c

o-or

dina

tion

with

oth

er tr

ade

activ

ities

and

inst

alla

tions

, suc

h th

at ro

utes

are

de

sign

ed w

ithou

t com

prom

ise

to th

e re

quire

d ve

ntila

tion

air fl

ow

rate

s.

Inst

alla

tio

n –

thro

ug

h w

all

a.

The

duct

slee

ve c

onne

ctin

g th

e fa

n ou

tlet t

o th

e te

rmin

al/g

rille

shou

ld b

e at

le

ast t

he sa

me

diam

eter

as t

he fa

n ou

tlet.

b.

The

duct

slee

ve sh

ould

be

rigid

. In

situ

atio

ns w

here

this

is n

ot p

ossi

ble,

fl e

xibl

e du

ctw

ork

may

be

used

, pro

vidi

ng e

xtra

ct v

entil

atio

n ra

tes a

re n

ot

com

prom

ised

. Fle

xibl

e du

ctw

ork

shou

ld b

e pu

lled

taut

.c.

Th

e in

stal

led

duct

slee

ve sh

ould

be

seal

ed to

the

exte

rnal

and

inte

rnal

wal

l to

mai

ntai

n ai

r tig

htne

ss. T

his i

s of p

artic

ular

impo

rtan

ce fo

r cav

ity w

alls

.d.

En

sure

that

ther

e ar

e no

obs

truc

tions

in th

e du

ct p

rior t

o fi t

ting

the

fan.




Tab

le 1

: Sys

tem

1 in

stal

lati

on

gu

idel

ines

(co

nti

nu

ed)

Inst

alla

tio

n c

lau

ses

Sup

ple

men

tary

info

rmat

ion

1.0

Inte

rmit

ten

t ex

trac

t fan

s (in

clu

din

g

coo

ker h

oo

ds)

(c

on

tin

ued

)

Inst

alla

tio

n –

thro

ug

h w

ind

ow

a.

Che

ck th

e su

itabi

lity

of th

e w

indo

w a

nd o

btai

n a

suita

ble

win

dow

mou

ntin

g ki

t fro

m th

e m

anuf

actu

rer f

or th

e pr

opos

ed fa

n un

it.

For w

indo

w m

ount

ed fa

ns, d

o no

t pl

an to

inst

all i

n op

enin

g lig

hts.

The

m

inim

um a

dvisa

ble

glas

s thi

ckne

ss is

4

mm

, but

seek

spec

ialis

t adv

ice

from

gl

azie

r for

mou

ntin

g su

itabi

lity.

Inst

alla

tio

n –

du

cted

a.

Rigi

d du

cts,

rect

angu

lar o

r circ

ular

, sho

uld

be u

sed

whe

reve

r pos

sible

. Whe

re

nece

ssar

y, fl

exib

le d

ucts

may

be

used

, but

thei

r len

gths

shou

ld b

e ke

pt to

a

min

imum

, con

nect

ing

to ri

gid

duct

wor

k at

the

earli

est o

ppor

tuni

ty.

b.

For fl

exi

ble

duct

con

nect

ed to

axi

al fa

ns th

e le

ngth

is li

mite

d to

1.5

met

res;

fo

r cen

trifu

gal f

ans t

he le

ngth

lim

it is

6 m

etre

s (fo

r ext

ract

rate

s 6 to

30

l/s),

and

3 m

etre

s (fo

r ext

ract

rate

s 31

to 6

0 l/s

).c.

Th

e nu

mbe

r of b

ends

is li

mite

d to

two

for u

p to

30

l/s, a

nd re

duce

s to

one

bend

for h

ighe

r ext

ract

rate

s.d.

Fl

exib

le d

uct s

houl

d be

pul

led

taug

ht to

ens

ure

that

the

full

inte

rnal

di

amet

er is

obt

aine

d an

d fl o

w re

sist

ance

min

imis

ed. T

his i

s con

side

red

to

have

bee

n ac

hiev

ed if

the

duct

is e

xten

ded

to 9

0% o

f its

max

imum

leng

th.

e.

Duc

ting

shou

ld b

e in

sula

ted

whe

re it

pas

ses t

hrou

gh u

nhea

ted

area

s and

vo

ids (

e.g.

loft

spac

es) w

ith th

e eq

uiva

lent

of a

t lea

st 2

5 m

m o

f a m

ater

ial

havi

ng a

ther

mal

con

duct

ivity

of ≤

0.04

W/(m

.K) t

o re

duce

the

poss

ibili

ty o

f co

nden

satio

n fo

rmin

g.f.

H

oriz

onta

l duc

ting,

incl

udin

g du

ctin

g in

wal

ls, s

houl

d be

arr

ange

d to

slop

e sl

ight

ly d

ownw

ards

aw

ay fr

om th

e fa

n to

pre

vent

bac

kfl o

w o

f any

moi

stur

e in

to th

e pr

oduc

t.g.

Ve

rtic

al d

uctin

g w

ill re

quire

a c

onde

nsat

e tr

ap in

ord

er to

pre

vent

ba

ckfl o

w o

f any

moi

stur

e in

to th

e pr

oduc

t. F

ollo

w th

e m

anuf

actu

rer’s

re

com

men

datio

ns in

thes

e in

stan

ces.

h.

Whe

re d

uctin

g pa

sses

thro

ugh

a fi r

e-st

oppi

ng w

all o

r fi re

com

part

men

t,

the

requ

ired

mea

sure

s to

ensu

re c

ompl

ianc

e w

ith P

art B

of t

he B

uild

ing

Regu

latio

ns sh

ould

be

take

n.

Exce

ptio

ns to

duc

t lim

its w

ill b

e ac

cept

ed p

rovi

ding

evi

denc

e fr

om

the

man

ufac

ture

r is a

vaila

ble

that

con

fi rm

s tha

t the

spec

ifi ed

pe

rfor

man

ce w

ill n

ot b

e af

fect

ed.

For i

n-lin

e fa

ns, r

efer

to

man

ufac

ture

r’s d

ata.

For d

uct i

nsta

llatio

ns, s

ee D

iagr

am 1

.W

here

pos

sible

, con

nect

stra

ight

le

ngth

s of d

uctw

ork

to fa

n sp

igot

.




Tab

le 1

: Sys

tem

1 in

stal

lati

on

gu

idel

ines

(co

nti

nu

ed)

Inst

alla

tio

n c

lau

ses

Sup

ple

men

tary

info

rmat

ion

Co

oke

r ho

od

sa.

C

ooke

r hoo

ds sh

ould

be

inst

alle

d so

that

acc

ess i

s eas

y fo

r cha

ngin

g an

d cl

eani

ng o

f the

fi lte

r/fi l

ters

.

Re-c

ircul

atin

g co

oker

hoo

ds d

o no

t pr

ovid

e ex

trac

t ven

tilat

ion.

To p

rovi

de

extr

act v

entil

atio

n in

a k

itche

n fo

r th

e pu

rpos

es o

f Par

t F, a

n ex

trac

t fan

to

out

side

shou

ld h

ave

an in

stal

led

capa

city

of a

t lea

st 6

0 l/s

.

2.0

Ven

tila

tio

n

air i

nle

ts a

nd

d

isch

arg

e te

rmin

als/

gri

lles

Bac

kgro

un

d v

enti

lato

rsa.

Ba

ckgr

ound

ven

tilat

ors s

houl

d be

pro

vide

d to

mee

t the

min

imum

requ

ired

equi

vale

nt a

rea

of v

entil

atio

n sp

ecifi

ed b

y Ta

ble

5.2a

of A

DF.

b.

For w

all m

ount

ed b

ackg

roun

d ve

ntila

tors

mak

e an

ope

ning

in th

e w

all

in a

ccor

danc

e w

ith th

e m

anuf

actu

rer’s

inst

ruct

ions

for t

he si

ze re

quire

d.

Ensu

re th

at th

ere

are

no o

bstr

uctio

ns in

the

open

ing.

c.

Inst

all t

he w

all o

r win

dow

ven

tilat

or p

rodu

ct in

acc

orda

nce

with

the

man

ufac

ture

r’s in

stru

ctio

ns.

d.

Ensu

re th

at w

all o

r win

dow

ven

tilat

or p

rodu

cts a

re se

aled

to th

eir s

urro

unds

us

ing

a pr

oprie

tary

seal

ant a

s rec

omm

ende

d by

the

man

ufac

ture

r.

Back

grou

nd v

entil

ator

s fi t

ted

in

win

dow

s are

usu

ally

inst

alle

d du

ring

man

ufac

ture

. Clo

se c

o-or

dina

tion

betw

een

supp

lier a

nd in

stal

ler i

s re

com

men

ded

to e

nsur

e co

rrec

t lo

catio

n of

ven

tilat

ors.

Back

grou

nd v

entil

ator

s ins

talle

d in

w

alls

may

requ

ire a

pro

prie

tary

win

d co

wl t

o re

duce

win

d no

ise a

nd p

reve

nt

over

-ven

tilat

ion.

Dis

char

ge

term

inal

s/g

rille

s –

roo

f an

d w

all m

ou

nte

da.

O

nly

prop

rieta

ry te

rmin

als s

houl

d be

use

d.b.

En

sure

that

the

free

are

a of

the

term

inal

/gril

le o

peni

ng is

a m

inim

um o

f 90

per

cen

t of t

he fr

ee a

rea

of th

e du

ctin

g be

ing

used

.




Tab

le 1

: Sys

tem

1 in

stal

lati

on

gu

idel

ines

(co

nti

nu

ed)

Inst

alla

tio

n c

lau

ses

Sup

ple

men

tary

info

rmat

ion

3.0

Mis

cella

neo

us

Air

tran

sfer

a.

To e

nsur

e go

od tr

ansf

er o

f air

thro

ugho

ut th

e dw

ellin

g, th

ere

shou

ld b

e an

un

derc

ut o

f min

imum

are

a 76

00 m

m2 i

n al

l int

erna

l doo

rs a

bove

the

fl oor

fi n

ish.

Thi

s is e

quiv

alen

t to

an u

nder

cut o

f 10

mm

for a

stan

dard

760

mm

w

idth

doo

r.b.

En

sure

that

the

air t

rans

fer p

rovi

sion

is u

nres

tric

ted

afte

r fl o

or fi

nish

es h

ave

been

laid

(e.g

. car

pets

shou

ld n

ot e

ncro

ach)

. Thi

s sho

uld

be a

chie

ved

by

mak

ing

an u

nder

cut o

f 10

mm

abo

ve th

e fl o

or fi

nish

if th

e fl o

or fi

nish

is

fi tte

d, o

r by

a 20

mm

und

ercu

t abo

ve th

e fl o

orbo

ards

, or o

ther

surf

ace,

if

the

fi nis

h ha

s not

bee

n fi t

ted.

4.0

Co

ntr

ols

Gen

eral

a.

Refe

r to

Tabl

e 5.

2a o

f AD

F.b.

En

sure

that

a lo

cal m

anua

l ove

rrid

e co

ntro

l is p

rovi

ded

for a

ny e

xtra

ct fa

n op

erat

ed b

y au

tom

atic

con

trol

s.

Hum

idity

con

trol

s sho

uld

not b

e us

ed

for s

anita

ry a

ccom

mod

atio

n w

here

od

our i

s the

mai

n po

lluta

nt.




Diagram 1: Duct installations

Airflow

Airflow

Room terminal/extract grille

CavitySealant

Discharge grille

Grilledischargeopening

Maximum length offlexible ducting

Flexibleducting supports

-

-

Minimum radius =the diameter of

flexible ducting used

Sleeve

✗

✓Do

Don’t

Preferred flexibleducting route

Restrictions

Peaks and troughs

b

a

The inner radius of any bend should be greater or equal to the diameter of the ducting being used. If the radius is reduced, the resistance of the bend will increase and the volume of air being extracted will decrease (see “Do” diagram above).

Ensure fl exible ducting is installed without peaks or troughs (see “Don’t” diagram above).




Tab

le 2

: Sys

tem

1 in

spec

tio

n a

nd

test

ing

Rec

om

men

dat

ion

s an

d m

inim

um

req

uir

emen

tsSu

pp

lem

enta

ry in

form

atio

n

1.0

Inte

rmit

ten

t ex

trac

t fan

s (in

clu

din

g

coo

ker h

oo

ds)

Vis

ual

insp

ecti

on

sC

arry

out

the

follo

win

g ch

ecks

and

reco

rd th

e re

sults

in S

ectio

n 5:

a.

Doe

s the

syst

em in

stal

latio

n co

mpl

y w

ith th

e in

stal

latio

n cl

ause

s in

Tabl

e 1?

b.

Doe

s the

num

ber o

f ext

ract

poi

nts a

nd te

rmin

als s

atis

fy Ta

ble

5.2a

in A

DF?

c.

Is a

ll eq

uipm

ent i

n go

od c

ondi

tion

with

no

obvi

ous d

efec

ts th

at w

ill b

e ha

zard

ous o

r aff

ect t

he sy

stem

per

form

ance

?

Fun

ctio

nal

ch

ecks

a.

Tem

pora

ry p

rote

ctio

n an

d pa

ckag

ing

shou

ld b

e re

mov

ed fr

om a

ll pr

oduc

ts.

b.

Che

ck fa

n op

erat

es c

orre

ctly

whe

n ac

tivat

ed b

y m

anua

l con

trol

(e.g

. lig

ht

switc

h), o

r aut

omat

ic c

ontr

ol (e

.g. P

IR).

c.

Ensu

re fa

n sw

itche

s off

aft

er c

ontr

ols a

re d

e-ac

tivat

ed a

nd, i

n th

e ca

se o

f ru

n-on

tim

ers,

that

thes

e ar

e se

t to

a m

inim

um o

f 15

min

utes

.

Unl

ess t

he ti

mer

con

trol

is g

radu

ated

in

min

utes

, run

-on

timer

s sho

uld

be

chec

ked

agai

nst a

tim

ed te

st a

nd

adju

sted

if ru

n tim

e is

less

than

15

min

utes

.

Air

fl o

w m

easu

rem

ent t

esti

ng

a.

Ensu

re th

at a

ll in

tend

ed b

ackg

roun

d ve

ntila

tors

or o

ther

air

tran

sfer

dev

ices

ar

e op

en.

b.

Ensu

re a

ll in

tern

al a

nd e

xter

nal d

oors

and

win

dow

s are

clo

sed,

incl

udin

g ro

oms i

n w

hich

mea

sure

men

ts a

re b

eing

car

ried

out.

c.

Air

fl ow

mea

sure

men

ts sh

ould

be

perf

orm

ed u

sing

a c

alib

rate

d ai

r fl o

w

devi

ce w

ith p

ropr

ieta

ry h

ood

atta

chm

ent a

nd re

sults

reco

rded

in li

tres

per

se

cond

(l/s

). Re

fere

nce

shou

ld b

e m

ade

to Ta

ble

5.1a

of A

DF

for d

esig

n ai

r fl o

w ra

tes.

d.

Reco

rd th

e ex

trac

t air

fl ow

for e

ach

extr

act f

an o

nto

the

com

mis

sion

ing

shee

t (se

e Se

ctio

n 5)

.e.

Th

e in

stru

men

t sho

uld

be c

alib

rate

d an

nual

ly a

nd b

e ca

pabl

e of

ach

ievi

ng

an a

ccur

acy

of ±

5 p

er c

ent.

No

te: T

his

is th

e ap

pro

ved

p

roce

du

re fo

r mea

suri

ng

the

air

fl o

w o

f in

term

itte

nt e

xtra

ct fa

ns

and

co

oke

r ho

od

s as

req

uir

ed b

y th

e B

uild

ing

Reg

ula

tio

ns.

The

mos

t com

mon

met

hod

is th

e us

e of

a v

ane

anem

omet

er, o

r sim

ilar,

plac

ed in

a h

ood

whi

ch c

over

s the

te

rmin

al to

mea

sure

the

extr

act a

ir fl o

w ra

te.

Cal

ibra

tion

of m

easu

rem

ent

equi

pmen

t sho

uld

be u

nder

take

n an

nual

ly b

y re

turn

ing

the

inst

rum

ent

to a

UK

AS

accr

edite

d ca

libra

tion

cent

re.




Tab

le 2

: Sys

tem

1 in

spec

tio

n a

nd

test

ing

(co

nti

nu

ed)

2.0

Bac

kgro

un

d

ven

tila

tors

Vis

ual

insp

ecti

on

sC

arry

out

the

follo

win

g ch

ecks

and

reco

rd th

e re

sults

in S

ectio

n 5:

a.

Doe

s the

equ

ival

ent a

rea

and

loca

tion

of a

ir in

lets

satis

fy Ta

ble

5.2a

in A

DF?

b.

Has

tem

pora

ry p

rote

ctio

n an

d pa

ckag

ing

been

rem

oved

from

all

back

grou

nd v

entil

ator

s, a

nd d

o th

e sh

utte

rs o

pen

and

clos

e co

rrec

tly?

c.

Is th

ere

an a

dequ

ate

seal

bet

wee

n th

e ve

ntila

tor p

rodu

ct a

nd th

e w

all/

win

dow

fram

e?

The

equi

vale

nt a

rea

shou

ld b

e di

spla

yed

on th

e ai

r inl

et p

rodu

ct.




Tab

le 3

: Sys

tem

2 in

stal

lati

on

gu

idel

ines

Inst

alla

tio

n c

lau

ses

Sup

ple

men

tary

info

rmat

ion

1.0

Du

ctw

ork

p

rep

arat

ion

an

d

inst

alla

tio

n

Man

ufa

ctu

rer’s

det

ails

an

d s

pec

ifi c

inst

ruct

ion

sa.

Th

e in

form

atio

n pr

ovid

ed in

this

Tabl

e se

ts o

ut th

e m

inim

um re

com

men

ded

proc

edur

es fo

r typ

ical

Sys

tem

2 in

stal

latio

ns.

b.

For f

urth

er p

rodu

ct-s

peci

fi c in

form

atio

n, re

fer t

o th

e m

anuf

actu

rer’s

in

stal

latio

n in

stru

ctio

ns.

c.

Inte

rnal

duc

t dia

met

ers a

nd/o

r cro

ss se

ctio

nal a

reas

shou

ld b

e no

less

than

th

e si

zes g

iven

in A

DF,

Tabl

e 5.

2b.

Prep

arat

ion

a.

Duc

ting

rout

es a

nd o

ffse

ts sh

ould

be

plan

ned

such

that

thei

r fi n

al

inst

alla

tion

is in

acc

orda

nce

with

the

illus

trat

ed g

uida

nce

give

n in

Dia

gram

s 2

and

3.b.

Se

para

te d

ucts

shou

ld b

e ta

ken

from

the

ceili

ngs o

f the

kitc

hen,

bat

hroo

m,

utili

ty ro

om o

r WC

to se

para

te te

rmin

als o

n th

e ro

of. D

o no

t use

com

mon

ou

tlet t

erm

inal

s or b

ranc

hed

duct

s.c.

W

here

duc

twor

k pe

netr

ates

a b

uild

ing’

s air

barr

ier,

the

cont

inui

ty o

f the

ba

rrie

r mus

t be

mai

ntai

ned.

The

nat

ure

of th

e ba

rrie

r and

eas

e of

ach

ievi

ng

an e

ffec

tive

seal

shou

ld b

e co

nsid

ered

bef

ore

hole

s are

dril

led.

d.

It is

impo

rtan

t to

cons

ider

the

plan

ning

and

inst

alla

tion

of d

uctw

ork

in c

o-or

dina

tion

with

oth

er tr

ade

activ

ities

and

inst

alla

tions

, suc

h th

at ro

utes

are

de

sign

ed w

ithou

t com

prom

ise

to th

e re

quire

d ve

ntila

tion

air fl

ow

rate

s.

Idea

lly, a

ll du

cts s

houl

d be

inst

alle

d as

ne

ar v

ertic

al a

s site

con

stra

ints

allo

w.

Both

rigi

d du

ctin

g an

d fl e

xibl

e du

ctin

g ar

e su

itabl

e fo

r PSV

syst

ems a

nd h

ave

simila

r res

istan

ce to

air

fl ow

at t

ypic

al

PSV

syst

em a

ir fl o

w ra

tes.




Tab

le 3

: Sys

tem

2 in

stal

lati

on

gu

idel

ines

(co

nti

nu

ed)

Inst

alla

tio

n c

lau

ses

Sup

ple

men

tary

info

rmat

ion

1.0

Du

ctw

ork

p

rep

arat

ion

an

d

inst

alla

tio

n

(co

nti

nu

ed)

Inst

alla

tio

na.

C

aref

ully

mea

sure

the

leng

th o

f duc

t to

be u

sed

such

that

it is

just

suffi

cien

t to

fi t b

etw

een

the

ceili

ng te

rmin

al a

nd th

e ou

tlet t

erm

inal

. Fle

xibl

e du

ctin

g sh

ould

be

fully

ext

ende

d bu

t not

taut

, allo

win

g ap

prox

imat

ely

300

mm

ext

ra

to m

ake

smoo

th b

ends

in a

n of

fset

syst

em.

b.

Duc

ting

shou

ld b

e pr

oper

ly su

ppor

ted

alon

g its

leng

th to

ens

ure

that

the

duct

can

run

stra

ight

with

out d

isto

rtio

n or

sagg

ing

and

that

ther

e ar

e no

kin

ks a

t any

ben

ds o

r the

con

nect

ions

to c

eilin

g te

rmin

als a

nd o

utle

t te

rmin

als.

Fle

xibl

e du

ctin

g ge

nera

lly re

quire

s mor

e su

ppor

t tha

n rig

id

duct

ing.

c.

In th

e ro

of sp

ace

the

duct

shou

ld b

e se

cure

d to

a w

oode

n st

rut t

hat i

s se

cure

ly fi

xed

at b

oth

ends

. A fl

exib

le d

uct s

houl

d be

allo

wed

to c

urve

gen

tly

at e

ach

end

of th

e st

rut t

o at

tach

to th

e ce

iling

term

inal

and

roof

out

let

term

inal

.d.

A

rigi

d du

ct sh

ould

be

used

for s

yste

m st

abili

ty fo

r the

par

t of a

PSV

syst

em

whi

ch is

out

side

, abo

ve th

e ro

of sl

ope.

It sh

ould

pro

ject

dow

n in

to th

e ro

of

spac

e fa

r eno

ugh

to a

llow

fi rm

supp

ort.

e.

Ensu

re th

at th

e du

ct is

secu

rely

fi xe

d to

the

roof

out

let t

erm

inal

so th

at it

ca

nnot

sag

or b

ecom

e de

tach

ed.

f.

Duc

ting

shou

ld b

e in

sula

ted

whe

re it

pas

ses t

hrou

gh u

nhea

ted

area

s and

vo

ids (

e.g.

loft

spac

es) w

ith th

e eq

uiva

lent

of a

t lea

st 2

5 m

m o

f a m

ater

ial

havi

ng a

ther

mal

con

duct

ivity

of ≤

0.04

W/(m

.K) t

o re

duce

the

poss

ibili

ty o

f co

nden

satio

n fo

rmin

g.g.

W

here

a d

uct e

xten

ds e

xter

nally

abo

ve ro

of le

vel t

he se

ctio

n ab

ove

the

roof

sh

ould

be

insu

late

d or

a c

onde

nsat

e tr

ap sh

ould

be

fi tte

d ju

st b

elow

roof

le

vel.




Tab

le 3

: Sys

tem

2 in

stal

lati

on

gu

idel

ines

(co

nti

nu

ed)

2.0

Ven

tila

tio

n

air i

nle

ts a

nd

d

isch

arg

e te

rmin

als

Bac

kgro

un

d v

enti

lato

rsa.

Ba

ckgr

ound

ven

tilat

ors s

houl

d be

pro

vide

d to

mee

t the

min

imum

requ

ired

equi

vale

nt a

rea

of v

entil

atio

n sp

ecifi

ed b

y Ta

ble

5.2b

of A

DF.

b.

For w

all m

ount

ed b

ackg

roun

d ve

ntila

tors

mak

e an

ope

ning

in th

e w

all

in a

ccor

danc

e w

ith th

e m

anuf

actu

rer’s

inst

ruct

ions

for t

he si

ze re

quire

d.

Ensu

re th

at th

ere

are

no o

bstr

uctio

ns in

the

open

ing.

c.

Inst

all t

he w

all o

r win

dow

ven

tilat

or p

rodu

ct in

acc

orda

nce

with

the

man

ufac

ture

r’s in

stru

ctio

ns.

d.

Ensu

re th

at w

all o

r win

dow

ven

tilat

or p

rodu

cts a

re se

aled

to th

eir s

urro

unds

us

ing

a pr

oprie

tary

seal

ant a

s rec

omm

ende

d by

the

man

ufac

ture

r.

Back

grou

nd v

entil

ator

s fi t

ted

in

win

dow

s are

usu

ally

inst

alle

d du

ring

man

ufac

ture

. Clo

se c

o-or

dina

tion

betw

een

supp

lier a

nd in

stal

ler i

s re

com

men

ded

to e

nsur

e co

rrec

t lo

catio

n of

ven

tilat

ors.

Back

grou

nd v

entil

ator

s ins

talle

d in

w

alls

may

requ

ire a

pro

prie

tary

win

d co

wl t

o re

duce

win

d no

ise a

nd p

reve

nt

over

ven

tilat

ion.

Extr

act t

erm

inal

s –

wal

l an

d c

eilin

g m

ou

nte

da.

PS

V e

xtra

ct te

rmin

als s

houl

d be

loca

ted

in th

e ce

iling

or o

n a

wal

l les

s tha

n 40

0 m

m b

elow

the

ceili

ng.

b.

The

extr

act t

erm

inal

shou

ld h

ave

a fr

ee a

rea

of n

ot le

ss th

an th

e du

ct c

ross

-se

ctio

nal a

rea.

If a

con

vers

ion

fi ttin

g is

requ

ired

to c

onne

ct th

e du

ct to

th

e te

rmin

al th

en th

e du

ct c

ross

-sec

tiona

l are

a sh

ould

be

mai

ntai

ned

(or

exce

eded

) thr

ough

out t

he c

onve

rsio

n fi t

ting

so a

s not

to re

stric

t the

fl ow

.

In n

on-s

anita

ry a

ccom

mod

atio

n,

hum

idity

con

trol

led

term

inal

s may

be

used

to in

crea

se th

e ai

r fl o

w d

urin

g pe

riods

of i

ncre

ased

hum

idity

, and

to

redu

ce th

e ai

r fl o

w d

urin

g pe

riods

of

low

hum

idity

. Hum

idity

con

trol

s sh

ould

not

be

used

for s

anita

ry

acco

mm

odat

ion

whe

re o

dour

is th

e m

ain

pollu

tant

.




Tab

le 3

: Sys

tem

2 in

stal

lati

on

gu

idel

ines

(co

nti

nu

ed)

Inst

alla

tio

n c

lau

ses

Sup

ple

men

tary

info

rmat

ion

2.0

Ven

tila

tio

n

air i

nle

ts a

nd

d

isch

arg

e te

rmin

als

(co

nti

nu

ed)

Dis

char

ge

term

inal

sa.

Pr

oprie

tary

pro

duct

s sho

uld

be u

sed

that

are

com

patib

le w

ith th

e PS

V d

uct

syst

em th

at h

as b

een

inst

alle

d.b.

Th

e ro

of te

rmin

al sh

ould

not

allo

w in

gres

s of l

arge

inse

cts o

r bird

s and

sh

ould

be

desi

gned

so th

at ra

in is

not

like

ly to

ent

er th

e du

ct a

nd ru

n do

wn

into

the

dwel

ling.

c.

The

term

inal

shou

ld a

lso

be d

esig

ned

such

that

any

con

dens

atio

n fo

rmin

g in

side

it c

anno

t run

dow

n in

to th

e dw

ellin

g bu

t will

run

off e

xter

nally

ont

o th

e ro

of.

d.

A ti

le v

entil

ator

use

d to

term

inat

e a

PSV

syst

em o

n th

e ro

of sl

ope

shou

ld b

e po

sitio

ned

no m

ore

than

0.5

m fr

om th

e ro

of ri

dge.

If th

e du

ct p

enet

rate

s th

e ro

of m

ore

than

0.5

m fr

om th

e rid

ge, i

t sho

uld

exte

nd a

bove

the

roof

sl

ope

to a

t lea

st ri

dge

heig

ht.

Refe

r to

Dia

gram

2 fo

r fur

ther

det

ails.

3.0

Mis

cella

neo

us

Air

tran

sfer

a.

To e

nsur

e go

od tr

ansf

er o

f air

thro

ugho

ut th

e dw

ellin

g, th

ere

shou

ld b

e an

un

derc

ut o

f min

imum

are

a 76

00 m

m2 i

n al

l int

erna

l doo

rs a

bove

the

fl oor

fi n

ish.

Thi

s is e

quiv

alen

t to

an u

nder

cut o

f 10

mm

for a

stan

dard

760

mm

w

idth

doo

r.b.

En

sure

that

the

air t

rans

fer p

rovi

sion

is u

nres

tric

ted

afte

r fl o

or fi

nish

es h

ave

been

laid

(e.g

. car

pets

shou

ld n

ot e

ncro

ach)

. Thi

s sho

uld

be a

chie

ved

by

mak

ing

an u

nder

cut o

f 10

mm

abo

ve th

e fl o

or fi

nish

if th

e fl o

or fi

nish

is

fi tte

d, o

r by

a 20

mm

und

ercu

t abo

ve th

e fl o

orbo

ards

, or o

ther

surf

ace,

if

the

fi nis

h ha

s not

bee

n fi t

ted.




Tab

le 4

: Sys

tem

2 in

spec

tio

n

Rec

om

men

ded

min

imu

m re

qu

irem

ents

Sup

ple

men

tary

info

rmat

ion

1.0

Du

ctw

ork

an

d

term

inal

s

Vis

ual

insp

ecti

on

sC

arry

out

the

follo

win

g ch

ecks

and

reco

rd th

e re

sults

in S

ectio

n 5:

a.

Doe

s the

syst

em in

stal

latio

n co

mpl

y w

ith th

e in

stal

latio

n cl

ause

s in

Tabl

e 3?

b.

Doe

s the

num

ber a

nd si

ze o

f ter

min

al p

oint

s sat

isfy

Tabl

e 5.

2b in

AD

F?c.

Is

all

duct

wor

k an

d ar

e al

l ter

min

als i

n go

od c

ondi

tion

with

no

obvi

ous

defe

cts t

hat w

ill b

e ha

zard

ous o

r aff

ect s

yste

m p

erfo

rman

ce?

2.0

Bac

kgro

un

d

ven

tila

tors

Vis

ual

insp

ecti

on

sC

arry

out

the

follo

win

g ch

ecks

and

reco

rd th

e re

sults

in S

ectio

n 5:

a.

Doe

s the

size

, num

ber,

orie

ntat

ion

and

loca

tion

of a

ir in

lets

satis

fy Ta

ble

5.2b

in

AD

F?b.

H

as a

ny te

mpo

rary

pro

tect

ion

and

pack

agin

g be

en re

mov

ed fr

om a

ll ba

ckgr

ound

ven

tilat

ors,

and

do

shut

ters

ope

n an

d cl

ose

corr

ectly

?c.

Is

ther

e an

ade

quat

e se

al b

etw

een

the

vent

ilato

r pro

duct

and

the

wal

l/w

indo

w fr

ame?

The

equi

vale

nt a

rea

shou

ld b

e di

spla

yed

on th

e ba

ckgr

ound

ve

ntila

tor p

rodu

ct.




Diagram 2: Suitable layouts for PSV systems

The layouts shown in Diagram 2 are considered to be suitable for the majority of dwellings of up to four storeys. Placing the outlet terminal at the ridge of the roof (Diagram 2(a)) is the preferred option for reducing the adverse effects of wind gusts and certain wind directions. A tile ventilator may be used to terminate a PSV system on the roof slope but the terminal should be positioned no more than 0.5 m from the roof ridge. If the duct penetrates the roof more than 0.5 m from the ridge, it should extend above the roof slope to at least ridge height to ensure that the duct terminal is in the negative pressure region above the roof (Diagram 2(b)).




Diagram 3: Suitable and unsuitable bends for passive stack ducts

Ducts should use no more than one offset (i.e. no more than two bends) and these should be of the “swept” rather than “sharp” type to minimise fl ow resistance. Offsets at an angle should be no more than 45° to the vertical (Diagram 3).




Section 3

Continuous mechanical ventilation systems

3.1 System 3 – Continuous mechanical extract: centralised and de-centralised

The information provided in Tables 5 and 6 gives guidance on good installation practice and the procedures for the inspection, air fl ow measurement testing and commissioning of continuous mechanical extract ventilation (MEV) systems for dwellings. The relevant design guidance is given in ADF, in particular, Table 5.2c.

3.2 System 4 – Continuous mechanical balanced systems with heat recovery: centralised and single room

The information provided in Tables 7 and 8 gives guidance on good installation practice and the procedures for the inspection, air fl ow measurement testing and commissioning of continuous mechanical balanced ventilation with heat recovery (MVHR) systems for dwellings. The relevant design guidance is given in ADF, in particular, Table 5.2d. The installation and inspection guidance is also suitable for single room heat recovery ventilators (SRHRV).



Section 3 Continuous mechanical ventilation systems | 25

Tab

le 5

: Sys

tem

3 in

stal

lati

on

gu

idel

ines

Inst

alla

tio

n c

lau

ses

Sup

ple

men

tary

info

rmat

ion

1.0

Co

nti

nu

ou

s ex

trac

t fan

s:

cen

tral

ised

Co

nti

nu

ou

s ex

trac

t fan

s:

dec

entr

alis

ed

Man

ufa

ctu

rer’s

det

ails

an

d s

pec

ifi c

inst

ruct

ion

sa.

Th

e in

form

atio

n pr

ovid

ed in

this

Tabl

e se

ts o

ut th

e m

inim

um re

com

men

ded

proc

edur

es fo

r typ

ical

Sys

tem

3 in

stal

latio

ns.

b.

For f

urth

er p

rodu

ct-s

peci

fi c in

form

atio

n, re

fer t

o th

e m

anuf

actu

rer’s

in

stal

latio

n in

stru

ctio

ns.

c.

The

suita

bilit

y of

con

nect

ion

of a

con

tinuo

us fa

n sy

stem

to a

coo

ker h

ood

mus

t fol

low

the

man

ufac

ture

r’s g

uida

nce.

Loca

tio

n o

f fan

un

ita.

Th

e fa

n un

it sh

ould

be

loca

ted

in a

ccor

danc

e w

ith th

e m

anuf

actu

rer’s

sp

ecifi

catio

ns.

b.

Ensu

re th

e fi n

al lo

catio

n of

equ

ipm

ent o

ffer

s suf

fi cie

nt sp

ace

to a

llow

acc

ess

for m

aint

enan

ce.

c.

The

fan

unit

shou

ld b

e in

stal

led

to a

llow

suffi

cien

t spa

ce fo

r end

of l

ife

repl

acem

ent o

f the

who

le u

nit o

r key

mec

hani

cal/e

lect

rical

com

pone

nts.

Th

is sh

ould

be

achi

evab

le w

ithou

t the

nee

d to

rem

ove

fi xed

stru

ctur

es o

r si

gnifi

cant

leng

ths o

f con

nect

ed d

uctw

ork.

d.

The

fan

unit

shou

ld b

e in

stal

led

on a

soun

d st

ruct

ure,

whi

ch is

stab

le a

nd

leve

l.

The

loca

tion

of th

e fa

n un

it sh

ould

be

cho

sen

to m

inim

ise o

vera

ll du

ct

run

leng

th, b

oth

from

the

inte

rnal

ex

trac

t ter

min

als/

grill

es to

the

fan

unit

and

from

the

fan

unit

to th

e ex

tern

al

disc

harg

e te

rmin

al.

Unc

ondi

tione

d sp

aces

, e.g

. lof

ts,

may

bec

ome

very

hot

in su

mm

er,

whi

ch m

ay h

ave

impl

icat

ions

for b

oth

mec

hani

cal a

nd e

lect

roni

c co

mpo

nent

lif

e.Re

fer t

o th

e m

anuf

actu

rer’s

sp

ecifi

catio

n fo

r app

ropr

iate

en

viro

nmen

tal c

ondi

tions

. Th

e fa

n un

it sp

igot

arr

ange

men

t m

ay d

icta

te th

e lo

catio

n an

d or

ient

atio

n of

inst

alla

tion:

to e

nsur

e op

timum

per

form

ance

refe

r to

the

man

ufac

ture

r’s in

stru

ctio

ns.

If a

fan

unit

is in

stal

led

in a

n un

heat

ed

spac

e, it

may

nee

d to

be

insu

late

d to

min

imise

the

risk

of c

onde

nsat

ion

form

ing

with

in th

e fa

n un

it ca

sing.




Tab

le 5

: Sys

tem

3 in

stal

lati

on

gu

idel

ines

(co

nti

nu

ed)

Inst

alla

tio

n c

lau

ses

Sup

ple

men

tary

info

rmat

ion

1.0

Co

nti

nu

ou

s ex

trac

t fan

s:

cen

tral

ised

Co

nti

nu

ou

s ex

trac

t fan

s:

dec

entr

alis

ed

(co

nti

nu

ed)

Prep

arat

ion

for i

nst

alla

tio

na.

A

hol

e of

a su

itabl

e di

men

sion

thro

ugh

the

fabr

ic o

f the

bui

ldin

g w

ill

be re

quire

d fo

r the

inst

alla

tion

of th

e du

ct. T

he h

ole

will

nee

d a

slig

ht

dow

nwar

d an

gle

tow

ards

the

outs

ide

to p

reve

nt w

ater

ingr

ess.

b.

Whe

re d

uctw

ork

pene

trat

es a

bui

ldin

g’s a

ir ba

rrie

r, th

e co

ntin

uity

of t

he

barr

ier m

ust b

e m

aint

aine

d. T

he n

atur

e of

the

barr

ier a

nd e

ase

of a

chie

ving

an

eff

ectiv

e se

al sh

ould

be

cons

ider

ed b

efor

e ho

les a

re d

rille

d.c.

Fo

r cei

ling

mou

nted

fans

or t

erm

inal

s/gr

illes

, the

hol

es sh

ould

be

cut t

o th

e m

inim

um re

quire

d siz

e su

ch th

at th

e fa

n/gr

ille

spig

ot fi

ts sn

ugly

into

the

hole

.d.

It

is im

port

ant t

o co

nsid

er th

e pl

anni

ng a

nd in

stal

latio

n of

duc

twor

k in

co-

ordi

natio

n w

ith o

ther

trad

e ac

tiviti

es a

nd in

stal

latio

ns, s

uch

that

rout

es a

re

desi

gned

with

out c

ompr

omis

e to

the

requ

ired

vent

ilatio

n ai

r fl o

w ra

tes.

Inst

alla

tio

na.

Th

e fa

n un

it sh

ould

be

inst

alle

d us

ing

the

man

ufac

ture

r’s su

pplie

d or

re

com

men

ded

fi xin

g br

acke

ts.

Aco

ustic

/ant

i-vib

ratio

n iso

latio

n m

ay b

e re

quire

d. T

his w

ill d

epen

d on

the

natu

re o

f the

mou

ntin

g st

ruct

ure:

refe

r to

the

man

ufac

ture

r’s

inst

ruct

ions

.




Tab

le 5

: Sys

tem

3 in

stal

lati

on

gu

idel

ines

(co

nti

nu

ed)

Inst

alla

tio

n c

lau

ses

Sup

ple

men

tary

info

rmat

ion

2.0

Du

ctw

ork

Du

ct in

stal

lati

on

– g

ener

al n

ote

sa.

D

ucts

shou

ld b

e si

zed

to m

inim

ise

pres

sure

loss

and

noi

se g

ener

atio

n. T

his i

s ac

hiev

ed b

y si

zing

of t

he d

ucts

to li

mit

the

air v

eloc

ity.

b.

The

rout

ing

of d

ucts

shou

ld m

inim

ise

over

all d

uct l

engt

h an

d m

inim

ise

the

num

ber o

f ben

ds re

quire

d. It

is p

artic

ular

ly im

port

ant t

o m

inim

ise

bend

s in

mai

n du

cts o

pera

ting

at h

ighe

r air

velo

citie

s.c.

Th

e ne

ed fo

r priv

acy

(aco

ustic

sepa

ratio

n) b

etw

een

room

s sho

uld

be

cons

ider

ed w

hen

plan

ning

duc

t lay

out.

d.

Whe

re ro

om a

ir ex

trac

t ter

min

als/

grill

es a

re n

ot fi

tted

with

fi lte

rs, s

uffi c

ient

sp

ace

to a

llow

acc

ess f

or c

lean

ing

duct

s sho

uld

be p

rovi

ded.

e.

Duc

ting

shou

ld b

e in

sula

ted

whe

re it

pas

ses t

hrou

gh u

nhea

ted

area

s and

vo

ids (

e.g.

loft

spac

es) w

ith th

e eq

uiva

lent

of a

t lea

st 2

5 m

m o

f a m

ater

ial

havi

ng a

ther

mal

con

duct

ivity

of ≤

0.04

W/(m

.K) t

o re

duce

the

poss

ibili

ty o

f co

nden

satio

n fo

rmin

g. W

here

a d

uct e

xten

ds a

bove

roof

leve

l the

sect

ion

abov

e th

e ro

of sh

ould

be

insu

late

d or

a c

onde

nsat

e tr

ap sh

ould

be

fi tte

d ju

st

belo

w ro

of le

vel.

f.

Hor

izon

tal d

uctin

g, in

clud

ing

duct

ing

in w

alls

, sho

uld

be a

rran

ged

to sl

ope

slig

htly

dow

nwar

ds a

way

from

the

fan

to p

reve

nt b

ackfl

ow

of a

ny m

oist

ure

into

the

prod

uct.

g.

Vert

ical

duc

ting

will

requ

ire a

con

dens

ate

trap

in o

rder

to p

reve

nt b

ackfl

ow

of

any

moi

stur

e in

to th

e pr

oduc

t.h.

Pe

rfor

ated

insu

late

d fl e

xi d

uct,

use

d to

min

imis

e ai

rbor

ne a

cous

tic

tran

smis

sion

, sho

uld

not b

e us

ed b

etw

een

the

fan

unit

and

exte

rnal

di

scha

rge

term

inal

to p

reve

nt c

onde

nsat

ion

occu

rrin

g w

ithin

the

insu

latio

n m

ater

ial.

i. W

here

duc

ts p

ass t

hrou

gh fi

re b

arrie

rs, t

hey

mus

t be

appr

opria

tely

fi re

st

oppe

d in

acc

orda

nce

with

the

requ

irem

ents

of P

art B

of t

he B

uild

ing

Regu

latio

ns (F

ire S

afet

y).

The

duct

size

and

type

spec

ifi ed

by

the

syst

em d

esig

ner s

houl

d al

way

s be

used

, to

min

imise

pre

ssur

e lo

ss a

nd

noise

gen

erat

ion.

Mai

n du

cts s

houl

d be

run

at th

e sa

me

size

as th

e fa

n un

it sp

igot

. Duc

t siz

e sh

ould

then

be

redu

ced

for b

ranc

h du

cts.

A ra

dial

layo

ut m

ay a

chie

ve a

cous

tic

sepa

ratio

n m

ore

effe

ctiv

ely

than

a

bran

ched

layo

ut.

The

perf

orm

ance

of t

he v

entil

atio

n sy

stem

relie

s on

effi c

ient

air

dist

ribut

ion

and

it is

vita

l tha

t duc

t in

stal

latio

n is

not l

eft u

ntil

the

last

m

omen

t whe

n th

e on

ly m

eans

of

over

com

ing

obst

ruct

ions

is to

inst

all

fl exi

ble

duct

s whe

re ri

gid

duct

s had

be

en sp

ecifi

ed.




Tab

le 5

: Sys

tem

3 in

stal

lati

on

gu

idel

ines

(co

nti

nu

ed)

Inst

alla

tio

n c

lau

ses

Sup

ple

men

tary

info

rmat

ion

2.0

Du

ctw

ork

(c

on

tin

ued

)

Inst

alla

tio

n o

f du

cts

– ri

gid

a.

Duc

ts sh

ould

not

be

inst

alle

d w

here

they

can

be

easi

ly d

amag

ed, f

or

exam

ple

acro

ss o

pen

loft

are

as w

here

they

may

be

stoo

d on

or h

ave

item

s pl

aced

on

them

, bre

akin

g se

als a

nd p

ossi

bly

crus

hing

the

duct

.b.

C

onne

ctio

n of

com

pone

nts s

houl

d no

t res

ult i

n si

gnifi

cant

air

fl ow

re

sist

ance

. Com

pone

nts s

houl

d be

pro

prie

tary

and

fi t e

asily

toge

ther

w

ithou

t dis

tort

ion.

c.

Rigi

d du

ct ru

ns m

ust b

e ad

equa

tely

supp

orte

d.

Dist

ortio

n of

rect

angu

lar d

uct m

ay

resu

lt in

sign

ifi ca

nt re

duct

ion

of

the

free

inte

rnal

are

a of

the

duct

, in

crea

sing

the

fl ow

resis

tanc

e an

d m

akin

g se

alin

g m

ore

diffi

cul

t.

Inst

alla

tio

n o

f du

cts

– fl

exib

lea.

D

ucts

shou

ld n

ot b

e in

stal

led

whe

re th

ey c

an b

e ea

sily

dam

aged

, for

ex

ampl

e ac

ross

ope

n lo

ft a

reas

whe

re th

ey m

ay b

e st

ood

on o

r hav

e ite

ms

plac

ed o

n th

em, c

rush

ing

the

duct

and

rest

rictin

g or

pre

vent

ing

all a

ir fl o

w

thro

ugh

the

duct

.b.

Fl

exib

le d

uct s

houl

d be

pul

led

taug

ht to

ens

ure

that

the

full

inte

rnal

di

amet

er is

obt

aine

d an

d fl o

w re

sist

ance

min

imis

ed. T

his i

s con

side

red

to

have

bee

n ac

hiev

ed if

the

duct

is e

xten

ded

to 9

0% o

f its

max

imum

leng

th.

c.

Flex

ible

duc

twor

k sh

ould

be

supp

orte

d at

suita

ble

inte

rval

s to

min

imis

e sa

ggin

g.d.

Be

nds i

n fl e

xibl

e du

ct sh

ould

hav

e a

min

imum

insi

de ra

dius

equ

al to

the

diam

eter

of t

he d

uct –

see

Dia

gram

1. I

f tig

hter

ben

ds a

re re

quire

d, ri

gid

bend

s sho

uld

be u

sed.

It is

sugg

este

d th

at fl

exib

le d

ucts

sh

ould

be

supp

orte

d at

inte

rval

s not

ex

ceed

ing

600

mm

.




Tab

le 5

: Sys

tem

3 in

stal

lati

on

gu

idel

ines

(co

nti

nu

ed)

Inst

alla

tio

n c

lau

ses

Sup

ple

men

tary

info

rmat

ion

2.0

Du

ctw

ork

(c

on

tin

ued

)

Du

ct c

on

nec

tio

ns

a.

All

duct

con

nect

ions

requ

ire se

alin

g. W

here

duc

ts a

re in

stal

led

agai

nst a

so

lid st

ruct

ure

this

can

be

diffi

cult

to a

chie

ve. I

n su

ch lo

catio

ns p

reas

sem

bly

of d

uct s

ectio

ns sh

ould

be

cons

ider

ed. T

his w

ill re

quire

that

con

nect

ions

are

pe

rman

ent t

o en

sure

the

seal

is m

aint

aine

d du

ring

inst

alla

tion.

b.

Whe

re a

cces

s to

duct

s will

not

be

poss

ible

aft

er c

onst

ruct

ion

is c

ompl

ete,

i.e

. duc

twor

k is

with

in fl

oor a

nd w

all v

oids

, con

side

ratio

n sh

ould

be

give

n to

per

man

ent c

onne

ctio

n an

d se

alin

g w

ith a

n ap

prop

riate

non

-har

deni

ng

seal

ant,

and

not

usi

ng d

uct t

ape

to a

chie

ve c

onne

ctio

n an

d se

alin

g.c.

C

onne

ctio

n of

leng

ths o

f fl e

xibl

e du

ct m

ust u

se a

rigi

d co

nnec

tor a

nd ju

bile

e cl

ips o

r sim

ilar t

o en

sure

a lo

ng te

rm se

al is

ach

ieve

d. C

onne

ctio

ns o

f len

gths

of

fl ex

ible

duc

t sho

uld

not b

e ta

ped-

only.

3.0

Ven

tila

tio

n

air i

nle

ts a

nd

in

tern

al a

ir

tran

sfer

Bac

kgro

un

d v

enti

lato

rsa.

Ba

ckgr

ound

ven

tilat

ors s

houl

d be

pro

vide

d to

mee

t the

min

imum

requ

ired

equi

vale

nt a

rea

of v

entil

atio

n sp

ecifi

ed b

y Ta

ble

5.2c

of A

DF.

b.

For w

all m

ount

ed b

ackg

roun

d ve

ntila

tors

mak

e an

ope

ning

in th

e w

all

in a

ccor

danc

e w

ith th

e m

anuf

actu

rer’s

inst

ruct

ions

for t

he si

ze re

quire

d.

Ensu

re th

at th

ere

are

no o

bstr

uctio

ns in

the

open

ing.

c.

Inst

all t

he w

all o

r win

dow

ven

tilat

or p

rodu

ct in

acc

orda

nce

with

the

man

ufac

ture

r’s in

stru

ctio

ns.

d.

Ensu

re th

at w

all o

r win

dow

ven

tilat

or p

rodu

cts a

re se

aled

to th

eir s

urro

unds

us

ing

a pr

oprie

tary

seal

ant a

s rec

omm

ende

d by

the

man

ufac

ture

r.




Tab

le 5

: Sys

tem

3 in

stal

lati

on

gu

idel

ines

(co

nti

nu

ed)

Inst

alla

tio

n c

lau

ses

Sup

ple

men

tary

info

rmat

ion

3.0

Ven

tila

tio

n

air i

nle

ts

and

inte

rnal

ai

r tra

nsf

er

(co

nti

nu

ed)

Air

tran

sfer

a.

To e

nsur

e go

od tr

ansf

er o

f air

thro

ugho

ut th

e dw

ellin

g, th

ere

shou

ld b

e an

un

derc

ut o

f min

imum

are

a 76

00 m

m2 i

n al

l int

erna

l doo

rs a

bove

the

fl oor

fi n

ish.

Thi

s is e

quiv

alen

t to

an u

nder

cut o

f 10

mm

for a

stan

dard

760

mm

w

idth

doo

r.b.

En

sure

that

the

air t

rans

fer p

rovi

sion

is u

nres

tric

ted

afte

r fl o

or fi

nish

es h

ave

been

laid

(e.g

. car

pets

shou

ld n

ot e

ncro

ach)

. Thi

s sho

uld

be a

chie

ved

by

mak

ing

an u

nder

cut o

f 10

mm

abo

ve th

e fl o

or fi

nish

if th

e fl o

or fi

nish

is

fi tte

d, o

r by

a 20

mm

und

ercu

t abo

ve th

e fl o

orbo

ards

, or o

ther

surf

ace,

if

the

fi nis

h ha

s not

bee

n fi t

ted.

4.0

Ro

om

ext

ract

ai

r ter

min

als/

gri

lles

Extr

act t

erm

inal

s/g

rille

s –

gen

eral

no

tes

a.

All

room

air

extr

act t

erm

inal

s sho

uld

be in

stal

led

as d

etai

led

by th

e sy

stem

de

sign

er.

b.

Room

air

extr

act t

erm

inal

s sho

uld

be in

stal

led

as c

lose

to c

eilin

g le

vel a

s pr

actic

al, t

o en

sure

war

m m

oist

air

is re

mov

ed fr

om e

ach

spac

e.

Fixe

d te

rmin

als

– g

rille

s o

r lo

uve

rsa.

If

the

room

ext

ract

air

term

inal

s are

fi xe

d, e

nsur

e th

at e

ffec

tive

bala

ncin

g of

th

e sy

stem

can

be

achi

eved

. If a

faci

lity

is n

ot p

rovi

ded

with

in th

e fa

n un

it th

en d

ampe

rs sh

ould

be

inst

alle

d w

ithin

the

duct

syst

em to

allo

w b

alan

cing

w

hen

the

syst

em is

com

mis

sion

ed.

Ad

just

able

term

inal

s/g

rille

sa.

En

sure

eac

h te

rmin

al/g

rille

can

be

lock

ed in

its c

omm

issi

oned

pos

ition

onc

e sy

stem

bal

ance

has

bee

n ac

hiev

ed. I

t is v

ital f

or th

e co

rrec

t ope

ratio

n of

the

syst

em th

at th

e sy

stem

rem

ains

bal

ance

d in

its c

omm

issi

oned

stat

e.




Tab

le 5

: Sys

tem

3 in

stal

lati

on

gu

idel

ines

(co

nti

nu

ed)

Inst

alla

tio

n c

lau

ses

Sup

ple

men

tary

info

rmat

ion

5.0

Exte

rnal

d

isch

arg

e te

rmin

al

Dis

char

ge

term

inal

s –

roo

f an

d w

all m

ou

nte

da.

Pr

oprie

tary

term

inal

s sho

uld

be u

sed.

b.

Ensu

re th

at th

e fr

ee a

rea

of th

e te

rmin

al o

peni

ng is

a m

inim

um o

f 90%

of

the

free

are

a of

the

duct

ing

bein

g us

ed.

c.

The

loca

tion

of th

e ex

tern

al d

isch

arge

term

inal

shou

ld e

nsur

e th

at th

e po

tent

ial f

or re

circ

ulat

ion

of e

xtra

ct a

ir th

roug

h ve

ntila

tion

air i

nlet

s is

min

imis

ed.

6.0

Co

ntr

ols

Co

ntr

ols

– g

ener

al n

ote

sa.

C

ontin

uous

ven

tilat

ion

syst

ems s

houl

d no

t allo

w th

e oc

cupi

er to

turn

off

the

fan

othe

r tha

n at

the

loca

l iso

lato

r. Pr

ovis

ion

of a

n on

/off

func

tion

will

resu

lt in

the

fans

bei

ng o

pera

ted

inte

rmitt

ently

and

the

requ

ired

cont

inuo

us a

ir fl o

w v

entil

atio

n ra

tes n

ot b

eing

ach

ieve

d.b.

W

here

sens

ors a

re n

ot p

re-in

stal

led

with

in th

e fa

n un

it, o

r add

ition

al

optio

nal s

enso

rs c

an b

e in

stal

led,

onl

y th

e se

nsor

s spe

cifi e

d by

the

man

ufac

ture

r of t

he fa

n un

it sh

ould

be

inst

alle

d.c.

If

sens

ors a

re d

uct m

ount

ed, t

heir

loca

tion

shou

ld b

e no

ted

and

prov

isio

n fo

r ac

cess

for m

aint

enan

ce o

r rep

lace

men

t mad

e.d.

If

cont

rol o

f the

fan

spee

d is

und

erta

ken

man

ually

, the

ope

ratio

n of

the

fan

in b

oost

mod

e sh

ould

be

mad

e ob

viou

s. T

his w

ill m

inim

ise

the

likel

ihoo

d of

it

bein

g le

ft in

this

mod

e un

nece

ssar

ily.

e.

Hum

idity

con

trol

shou

ld n

ot b

e us

ed in

sani

tary

acc

omm

odat

ion,

whe

re

odou

r is t

he m

ain

pollu

tant

.

Inst

alla

tion

of a

ltern

ativ

e se

nsor

s m

ay re

sult

in c

ontr

ol fu

nctio

ns n

ot

perf

orm

ing

corr

ectly

.




Tab

le 5

: Sys

tem

3 in

stal

lati

on

gu

idel

ines

(co

nti

nu

ed)

Inst

alla

tio

n c

lau

ses

Sup

ple

men

tary

info

rmat

ion

6.0

Co

ntr

ols

(c

on

tin

ued

)

Co

ntr

ols

– lo

cati

on

an

d c

on

fi g

ura

tio

na.

In

stal

latio

n of

man

ual c

ontr

ols f

or th

e sy

stem

mus

t mee

t the

requ

irem

ents

of

Par

t M o

f the

Bui

ldin

g Re

gula

tions

.b.

In

stal

latio

n of

room

sens

ors s

houl

d fo

llow

the

man

ufac

ture

r’s g

uida

nce

on

posi

tioni

ng.

c.

Whe

re c

ontr

ol o

f the

fan

spee

d is

und

erta

ken

man

ually

, sw

itchi

ng sh

ould

be

pro

vide

d lo

cally

to th

e sp

aces

bei

ng se

rved

, i.e

. bat

hroo

ms a

nd k

itche

n.

Prov

isio

n of

a si

ngle

cen

tral

ly lo

cate

d sw

itch

is n

ot su

ffi ci

ent a

nd w

ill re

sult

in

fans

bei

ng le

ft in

inap

prop

riate

mod

es o

f ope

ratio

n.

App

rove

d D

ocum

ent M

, Sec

tion

8.3,

re

com

men

ds th

at sw

itche

s sho

uld

be lo

cate

d be

twee

n 45

0 m

m a

nd

1200

mm

from

fi ni

shed

fl oo

r lev

el.

7.0

Co

nti

nu

ou

s ex

trac

t fan

s:

dec

entr

alis

ed

In-d

uct

inst

alla

tio

na.

Th

e fa

n un

it sh

ould

be

adeq

uate

ly su

ppor

ted

usin

g th

e m

anuf

actu

rer’s

su

pplie

d or

reco

mm

ende

d fi x

ing

brac

kets

.b.

A

cces

s sho

uld

be p

rovi

ded

to th

e fa

n un

it fo

r mai

nten

ance

and

repl

acem

ent

at th

e en

d of

its o

pera

tiona

l life

.




Tab

le 6

: Sys

tem

3 in

spec

tio

n, t

esti

ng

an

d c

om

mis

sio

nin

g

Rec

om

men

ded

min

imu

m re

qu

irem

ents

Sup

ple

men

tary

info

rmat

ion

1.0

Syst

em

ove

rvie

w

Vis

ual

insp

ecti

on

sC

arry

out

the

follo

win

g ch

ecks

and

reco

rd th

e re

sults

in S

ectio

n 5:

a.

Doe

s the

syst

em in

stal

latio

n co

mpl

y w

ith th

e in

stal

latio

n cl

ause

s in

Tabl

e 5?

b.

Is th

e sy

stem

inst

alle

d in

acc

orda

nce

with

des

ign

crite

ria?

c.

Is a

ll du

ctw

ork

and

are

all t

erm

inal

s in

good

con

ditio

n w

ith n

o ob

viou

s de

fect

s tha

t will

be

haza

rdou

s or a

ffec

t sys

tem

per

form

ance

?

Init

ial s

tart

-up

a.

Is th

e ai

r fl o

w d

irect

ion

corr

ect a

t eac

h ro

om te

rmin

al?

b.

Are

ther

e an

y ab

norm

al n

oise

s on

star

t-up

or w

hen

the

syst

em is

runn

ing

in

norm

al b

ackg

roun

d ve

ntila

tion

mod

e?

Som

e fa

n un

its h

ave

a st

art-

up

diag

nost

ic se

quen

ce th

at ru

ns th

e fa

ns a

t max

imum

spee

d fo

r a p

erio

d be

fore

reve

rtin

g to

nor

mal

ope

ratio

n –

refe

r to

the

man

ufac

ture

r’s o

pera

ting

inst

ruct

ions

.




Tab

le 6

: Sys

tem

3 in

spec

tio

n, t

esti

ng

an

d c

om

mis

sio

nin

g

Min

imu

m re

qu

irem

ents

Sup

ple

men

tary

info

rmat

ion

2.0

Com

mis

sion

ing:

ai

r fl o

w

bal

anci

ng

an

d

mea

sure

men

t

Air

fl o

w b

alan

cin

ga.

Th

e sy

stem

shou

ld b

e ba

lanc

ed to

ens

ure

that

des

ign

air fl

ow

rate

s are

ac

hiev

ed a

t eac

h ro

om te

rmin

al/g

rille

. As t

here

are

seve

ral c

ombi

natio

ns o

f ro

om te

rmin

al/g

rille

(ref

erre

d to

as a

term

inal

from

her

e on

) and

fan

cont

rol

that

may

be

used

in d

omes

tic sy

stem

s, th

e fa

n m

anuf

actu

rer’s

inst

ruct

ions

sh

ould

be

follo

wed

to a

chie

ve b

alan

cing

. If s

peci

fi c d

etai

ls a

re n

ot in

clud

ed

the

follo

win

g pr

oced

ure

shou

ld b

e ad

opte

d:i.

Ad

just

able

term

inal

s an

d a

fi xe

d (s

tep

ped

) sp

eed

fan

.Th

e fa

n sp

eed

shou

ld b

e se

t to

achi

eve

the

desi

red

cont

inuo

us fl

ow ra

te.

The

inde

x te

rmin

al fl

ow ra

te is

set t

o fu

lly o

pen

and

all o

ther

gril

les a

re

adju

sted

to a

chie

ve th

e re

quire

d fl o

ws a

t eac

h te

rmin

al.

If

the

tota

l fl o

w ra

te c

anno

t be

achi

eved

thro

ugh

all t

he te

rmin

als t

hen

the

fan

spee

d sh

ould

be

incr

ease

d.

If al

l the

term

inal

s hav

e to

be

clos

ed si

gnifi

cant

ly to

ach

ieve

onl

y th

e re

quire

d ai

r fl o

w ra

te th

en re

duce

the

fan

spee

d an

d re

bala

nce

the

term

inal

s.ii.

A

dju

stab

le te

rmin

als

and

co

ntr

olla

ble

sp

eed

fan

.

The

fan

spee

d sh

ould

be

set a

ppro

xim

atel

y to

ach

ieve

the

desi

red

cont

inuo

us fl

ow ra

te.

Th

e in

dex

term

inal

fl ow

rate

is se

t with

the

term

inal

fully

ope

n an

d al

l oth

er te

rmin

als a

re a

djus

ted

to a

chie

ve th

e re

quire

d fl o

ws a

t eac

h te

rmin

al.

If

the

inde

x te

rmin

al h

as to

be

clos

ed to

ach

ieve

onl

y th

e re

quire

d ai

r fl o

w ra

te, t

hen

redu

ce th

e fa

n sp

eed

and

reba

lanc

e th

e te

rmin

als.

No

te: T

his

is th

e ap

pro

ved

p

roce

du

re fo

r co

mm

issi

on

ing

as

req

uir

ed b

y th

e B

uild

ing

R

egu

lati

on

s.Th

e in

dex

term

inal

/gril

le c

an b

e as

sum

ed to

be

the

term

inal

furt

hest

fr

om th

e fa

n un

it.




Tab

le 6

: Sys

tem

3 in

spec

tio

n, t

esti

ng

an

d c

om

mis

sio

nin

g (c

on

tin

ued

)

Min

imu

m re

qu

irem

ents

Sup

ple

men

tary

info

rmat

ion

2.0

Com

mis

sion

ing:

ai

r fl o

w

bal

anci

ng

an

d

mea

sure

men

t (c

on

tin

ued

)

iii.

Fixe

d te

rmin

als

wit

h fl

ow

ad

just

men

t by

du

ct d

amp

er o

r sim

ilar

dev

ice

at th

e fa

n u

nit

.A

s i. o

r ii.

abov

e de

pend

ing

on th

e ty

pe o

f fan

spee

d co

ntro

l.iv

. A

dju

stab

le te

rmin

als

and

fi xe

d v

olu

me

fl o

w fa

n.

Th

e fa

n sp

eed

shou

ld b

e se

t to

achi

eve

the

desi

red

cont

inuo

us fl

ow ra

te.

The

inde

x te

rmin

al fl

ow ra

te is

set w

ith th

e te

rmin

al fu

lly o

pen

and

all o

ther

term

inal

s are

adj

uste

d to

ach

ieve

the

requ

ired

fl ow

s at e

ach

term

inal

. Adj

ustm

ent o

f the

term

inal

s ach

ieve

s bal

anci

ng o

nly;

tota

l fl o

w ra

te is

gov

erne

d by

the

fan

cont

rol s

ettin

g. G

reat

car

e sh

ould

be

take

n no

t to

clos

e th

e te

rmin

als t

oo fa

r as t

he fa

n un

it w

ill a

lway

s m

aint

ain

a co

nsta

nt v

olum

etric

fl ow

rate

; clo

sing

the

term

inal

s will

onl

y re

quire

the

fan

to w

ork

hard

er to

ach

ieve

a g

iven

air

fl ow

rate

.v.

Fi

xed

term

inal

s w

ith

au

tom

atic

fl o

w a

dju

stm

ent a

t th

e fa

n u

nit

.

The

fan

spee

d sh

ould

be

set t

o ac

hiev

e th

e de

sire

d co

ntin

uous

fl ow

rate

.Th

e fl o

ws a

re b

alan

ced

by a

utom

atic

dev

ices

loca

ted

with

in th

e fa

n un

it,

and

no a

djus

tmen

t can

be

mad

e.




Tab

le 6

: Sys

tem

3 in

spec

tio

n, t

esti

ng

an

d c

om

mis

sio

nin

g (c

on

tin

ued

)

Min

imu

m re

qu

irem

ents

Sup

ple

men

tary

info

rmat

ion

2.0

Com

mis

sion

ing:

ai

r fl o

w

bal

anci

ng

an

d

mea

sure

men

t (c

on

tin

ued

)

Air

fl o

w m

easu

rem

ents

a.

Ensu

re th

at b

ackg

roun

d ve

ntila

tors

or o

ther

air

tran

sfer

dev

ices

are

ope

n.b.

En

sure

all

inte

rnal

and

ext

erna

l doo

rs a

nd w

indo

ws a

re c

lose

d, in

clud

ing

room

s in

whi

ch m

easu

rem

ents

are

bei

ng c

arrie

d ou

t.c.

A

ir fl o

w m

easu

rem

ents

shou

ld b

e pe

rfor

med

usi

ng a

cal

ibra

ted

air fl

ow

de

vice

with

pro

prie

tary

hoo

d at

tach

men

t and

resu

lts re

cord

ed in

litr

es p

er

seco

nd (l

/s).

Refe

renc

e sh

ould

be

mad

e to

des

ign

air fl

ow

rate

s.d.

Re

cord

the

air fl

ow

rate

at e

ach

room

term

inal

on

the

com

mis

sion

ing

shee

t in

Sect

ion

5, a

long

with

the

desi

gn a

ir fl o

w ra

te fo

r eac

h te

rmin

al.

Mea

sure

men

ts sh

ould

be

take

n at

bot

h m

axim

um ra

te a

nd m

inim

um ra

te

fan

spee

ds.

e.

It is

reco

mm

ende

d th

at a

van

e an

emom

eter

or s

imila

r dev

ice

is u

sed

to b

alan

ce a

nd m

easu

re th

e ai

r fl o

w ra

tes a

t eac

h ro

om te

rmin

al. T

he

inst

rum

ent w

ill re

quire

a h

ood

to b

e at

tach

ed to

allo

w it

to c

over

the

term

inal

.f.

Th

e in

stru

men

t sho

uld

be c

alib

rate

d an

nual

ly a

nd b

e ca

pabl

e of

ach

ievi

ng

an a

ccur

acy

of ±

5 p

er c

ent.

No

te: T

his

is th

e ap

pro

ved

p

roce

du

re fo

r air

fl o

w

mea

sure

men

t as

req

uir

ed b

y th

e B

uild

ing

Reg

ula

tio

ns.

The

mos

t com

mon

met

hod

is th

e us

e of

a v

ane

anem

omet

er, o

r sim

ilar,

plac

ed in

a h

ood

whi

ch c

over

s the

te

rmin

al to

mea

sure

the

extr

act a

ir fl o

w ra

te.

Cal

ibra

tion

of m

easu

rem

ent

equi

pmen

t sho

uld

be u

nder

take

n an

nual

ly b

y re

turn

ing

the

inst

rum

ent

to a

UK

AS

accr

edite

d ca

libra

tion

cent

re.




Tab

le 6

: Sys

tem

3 in

spec

tio

n, t

esti

ng

an

d c

om

mis

sio

nin

g (c

on

tin

ued

)

Rec

om

men

ded

min

imu

m re

qu

irem

ents

Sup

ple

men

tary

info

rmat

ion

3.0

Co

ntr

ols

Inst

alla

tio

na.

En

sure

all

loca

l con

trol

s hav

e be

en in

stal

led

follo

win

g th

e m

anuf

actu

rer’s

in

stru

ctio

ns.

b.

Ensu

re a

ll lo

cal c

ontr

ols a

re a

dequ

atel

y la

belle

d, in

dica

ting

thei

r fun

ctio

n cl

early

.c.

If

sens

ors h

ave

been

inst

alle

d se

para

tely

from

the

fan

unit

ensu

re in

stal

latio

n fo

llow

s the

man

ufac

ture

r’s in

stru

ctio

ns.

d.

Whe

re c

ontr

ol o

f the

fan

is a

utom

ated

, the

con

trol

s sho

uld

be c

onfi g

ured

to

min

imis

e th

e oc

curr

ence

of h

untin

g.e.

If

man

ual c

ontr

ol is

pro

vide

d, c

lear

and

det

aile

d in

stru

ctio

ns sh

ould

be

mad

e av

aila

ble

to th

e oc

cupi

er.

If hu

ntin

g (th

e co

ntin

ual i

ncre

ase

and

decr

ease

of f

an sp

eed)

doe

s oc

cur,

occu

pant

s may

seek

to m

odify

th

e co

ntro

l of t

he sy

stem

or t

urn

it of

f alto

geth

er to

rem

ove

the

noise

nu

isanc

e.

Test

ing

op

erat

ion

a.

As f

ar a

s pra

ctic

al th

e co

rrec

t ope

ratio

n of

eac

h co

ntro

l fun

ctio

n sh

ould

be

test

ed.




Tab

le 7

: Sys

tem

4 in

stal

lati

on

gu

idel

ines

Inst

alla

tio

n c

lau

ses

Sup

ple

men

tary

info

rmat

ion

1.0

Co

nti

nu

ou

s su

pp

ly a

nd

ex

trac

t wit

h

hea

t rec

ove

ry:

cen

tral

ised

Co

nti

nu

ou

s si

ng

le ro

om

su

pp

ly a

nd

ex

trac

t wit

h

hea

t rec

ove

ry

Man

ufa

ctu

rer’s

det

ails

an

d s

pec

ifi c

inst

ruct

ion

sa.

Th

e in

form

atio

n pr

ovid

ed in

this

Tabl

e se

ts o

ut th

e m

inim

um re

com

men

ded

proc

edur

es fo

r typ

ical

Sys

tem

4 in

stal

latio

ns.

b.

For f

urth

er p

rodu

ct-s

peci

fi c in

form

atio

n, re

fer t

o th

e m

anuf

actu

rer’s

in

stal

latio

n in

stru

ctio

ns.

c.

The

suita

bilit

y of

con

nect

ion

of a

con

tinuo

us fa

n sy

stem

to a

coo

ker h

ood

mus

t fol

low

the

man

ufac

ture

r’s g

uida

nce.




Tab

le 7

: Sys

tem

4 in

stal

lati

on

gu

idel

ines

(co

nti

nu

ed)

Inst

alla

tio

n c

lau

ses

Sup

ple

men

tary

info

rmat

ion

1.0

Co

nti

nu

ou

s su

pp

ly a

nd

ex

trac

t wit

h

hea

t rec

ove

ry:

cen

tral

ised

Co

nti

nu

ou

s si

ng

le ro

om

su

pp

ly a

nd

ex

trac

t wit

h

hea

t rec

ove

ry

(co

nti

nu

ed)

Loca

tio

n o

f fan

un

ita.

Th

e fa

n un

it sh

ould

be

loca

ted

as sp

ecifi

ed b

y th

e sy

stem

des

igne

r.b.

Fa

n un

its sh

ould

be

inst

alle

d to

allo

w su

ffi ci

ent s

pace

to u

nder

take

rout

ine

mai

nten

ance

on

fi lte

rs a

nd h

eat e

xcha

nger

blo

ck a

s app

ropr

iate

.c.

Fa

n un

its sh

ould

be

inst

alle

d to

allo

w su

ffi ci

ent s

pace

for e

nd o

f life

re

plac

emen

t of t

he w

hole

uni

t or o

f key

mec

hani

cal/e

lect

rical

com

pone

nts.

Th

is sh

ould

be

achi

evab

le w

ithou

t the

nee

d to

rem

ove

fi xed

stru

ctur

es o

r si

gnifi

cant

leng

ths o

f con

nect

ed d

uctw

ork.

d.

The

fan

unit

shou

ld b

e in

stal

led

on a

soun

d st

ruct

ure,

whi

ch is

stab

le a

nd

leve

l.e.

If

the

fan

unit

is n

ot p

re-in

sula

ted,

insu

latio

n sh

ould

be

adde

d to

min

imis

e th

e ris

k of

con

dens

atio

n fo

rmin

g w

ithin

, or o

n, th

e fa

n un

it ca

sing

.f.

A

con

dens

ate

drai

n sh

ould

be

inst

alle

d fr

om th

e fa

n un

it to

an

appr

opria

te

drai

n lo

catio

n. T

he c

onde

nsat

e pi

pe sh

ould

be

inst

alle

d to

hav

e a

min

imum

5º

fall

from

the

fan

unit.

g.

The

cond

ensa

te d

rain

shou

ld b

e ad

equa

tely

secu

red

and

whe

re p

assi

ng

thro

ugh

an u

nhea

ted

spac

e m

ust b

e ad

equa

tely

insu

late

d to

pre

vent

fr

eezi

ng.

Ad

dit

ion

al n

ote

s fo

r SR

HRV

a.

Do

not i

nsta

ll th

e un

it in

the

corn

er o

f a ro

om a

s thi

s may

resu

lt in

shor

t ci

rcui

ting

of a

ir fl o

ws.

The

loca

tion

of th

e fa

n un

it sh

ould

be

cho

sen

to m

inim

ise o

vera

ll du

ct

run

leng

th, b

oth

from

the

inte

rnal

te

rmin

als/

grill

es to

the

fan

unit

and

from

the

fan

unit

to th

e ex

tern

al

disc

harg

e te

rmin

al.

Unc

ondi

tione

d sp

aces

, e.g

. lof

ts,

may

bec

ome

very

hot

in su

mm

er,

whi

ch m

ay h

ave

impl

icat

ions

for b

oth

mec

hani

cal a

nd e

lect

roni

c co

mpo

nent

lif

e –

refe

r to

the

man

ufac

ture

r’s

spec

ifi ca

tion

for a

ppro

pria

te

envi

ronm

enta

l con

ditio

ns.

The

fan

unit

spig

ot a

rran

gem

ent

may

dic

tate

the

loca

tion

and

orie

ntat

ion

of in

stal

latio

n: to

ens

ure

optim

um p

erfo

rman

ce re

fer t

o th

e m

anuf

actu

rer’s

inst

ruct

ions

.Th

e ra

te o

f con

dens

ate

form

atio

n m

ay

be u

p to

seve

ral l

itres

per

day

, and

this

sh

ould

be

cons

ider

ed w

hen

choo

sing

the

drai

n lo

catio

n.




Tab

le 7

: Sys

tem

4 in

stal

lati

on

gu

idel

ines

(co

nti

nu

ed)

Inst

alla

tio

n c

lau

ses

Sup

ple

men

tary

info

rmat

ion

1.0

Co

nti

nu

ou

s su

pp

ly a

nd

ex

trac

t wit

h

hea

t rec

ove

ry:

cen

tral

ised

Co

nti

nu

ou

s si

ng

le ro

om

su

pp

ly a

nd

ex

trac

t wit

h

hea

t rec

ove

ry

(co

nti

nu

ed)

Prep

arat

ion

for i

nst

alla

tio

na.

A

hol

e of

a su

itabl

e di

men

sion

thro

ugh

the

fabr

ic o

f the

bui

ldin

g w

ill

be re

quire

d fo

r the

inst

alla

tion

of th

e du

ct. T

he h

ole

will

nee

d a

slig

ht

dow

nwar

d an

gle

tow

ards

the

outs

ide

to p

reve

nt w

ater

ingr

ess.

b.

Whe

re d

uctw

ork

pene

trat

es a

bui

ldin

g’s a

ir ba

rrie

r, th

e co

ntin

uity

of t

he

barr

ier m

ust b

e m

aint

aine

d. T

he n

atur

e of

the

barr

ier a

nd e

ase

of a

chie

ving

an

eff

ectiv

e se

al sh

ould

be

cons

ider

ed b

efor

e ho

les a

re d

rille

d.c.

Fo

r cei

ling

mou

nted

fans

or t

erm

inal

s/gr

illes

, the

hol

es sh

ould

be

cut t

o th

e m

inim

um re

quire

d siz

e su

ch th

at th

e fa

n/gr

ille

spig

ot fi

ts sn

ugly

into

the

hole

.d.

It

is im

port

ant t

o co

nsid

er th

e pl

anni

ng a

nd in

stal

latio

n of

duc

twor

k in

co-

ordi

natio

n w

ith o

ther

trad

e ac

tiviti

es a

nd in

stal

latio

ns, s

uch

that

rout

es a

re

desi

gned

with

out c

ompr

omis

e to

the

requ

ired

vent

ilatio

n ai

r fl o

w ra

tes.

Inst

alla

tio

na.

Th

e fa

n un

it sh

ould

be

inst

alle

d us

ing

the

man

ufac

ture

r’s su

pplie

d or

re

com

men

ded

fi xin

g br

acke

ts.

Aco

ustic

/ant

i-vib

ratio

n iso

latio

n m

ay b

e re

quire

d. T

his w

ill d

epen

d on

the

natu

re o

f the

mou

ntin

g st

ruct

ure

– re

fer t

o th

e m

anuf

actu

rer’s

in

stru

ctio

ns.




Tab

le 7

: Sys

tem

4 in

stal

lati

on

gu

idel

ines

(co

nti

nu

ed)

Inst

alla

tio

n c

lau

ses

Sup

ple

men

tary

info

rmat

ion

2.0

Du

ctw

ork

Du

ct in

stal

lati

on

– g

ener

al n

ote

sa.

D

ucts

shou

ld b

e si

zed

to m

inim

ise

pres

sure

loss

and

noi

se g

ener

atio

n. T

his i

s ac

hiev

ed b

y si

zing

of t

he d

ucts

to li

mit

the

air v

eloc

ity.

b.

The

rout

ing

of d

ucts

shou

ld a

im to

min

imis

e ov

eral

l duc

t len

gth

and

min

imis

e th

e nu

mbe

r of b

ends

requ

ired.

It is

par

ticul

arly

impo

rtan

t to

min

imis

e be

nds i

n m

ain

duct

s ope

ratin

g at

hig

her a

ir ve

loci

ties.

c.

The

need

for p

rivac

y (a

cous

tic se

para

tion)

bet

wee

n ro

oms s

houl

d be

co

nsid

ered

whe

n pl

anni

ng d

uct l

ayou

t.d.

W

here

room

air

extr

act t

erm

inal

s/gr

illes

are

not

fi tt

ed w

ith fi

lters

, co

nsid

erat

ion

shou

ld b

e gi

ven

to th

e ne

ed to

acc

ess d

ucts

for c

lean

ing.

e.

Duc

ting

shou

ld b

e in

sula

ted

whe

re it

pas

ses t

hrou

gh u

nhea

ted

area

s and

vo

ids (

e.g.

loft

spac

es) w

ith th

e eq

uiva

lent

of a

t lea

st 2

5 m

m o

f a m

ater

ial

havi

ng a

ther

mal

con

duct

ivity

of ≤

0.04

W/(m

.K) t

o re

duce

the

poss

ibili

ty o

f co

nden

satio

n fo

rmin

g. W

here

a d

uct e

xten

ds e

xter

nally

abo

ve ro

of le

vel t

he

sect

ion

abov

e th

e ro

of sh

ould

be

insu

late

d or

a c

onde

nsat

e tr

ap sh

ould

be

fi tte

d ju

st b

elow

roof

leve

l.

The

duct

size

and

type

spec

ifi ed

by

the

syst

em d

esig

ner s

houl

d al

way

s be

used

, to

min

imise

pre

ssur

e lo

ss a

nd

noise

gen

erat

ion.

Mai

n du

cts s

houl

d be

run

at th

e sa

me

size

as th

e fa

n un

it sp

igot

. Duc

t siz

e sh

ould

then

be

redu

ced

for b

ranc

h du

cts.

A ra

dial

layo

ut m

ay a

chie

ve a

cous

tic

sepa

ratio

n m

ore

effe

ctiv

ely

than

a

bran

ched

layo

ut.

The

perf

orm

ance

of t

he v

entil

atio

n sy

stem

relie

s on

effi c

ient

air

dist

ribut

ion

and

it is

vita

l tha

t duc

t in

stal

latio

n is

not l

eft u

ntil

the

last

m

omen

t whe

n th

e on

ly m

eans

of

over

com

ing

obst

ruct

ions

is to

inst

all

fl exi

ble

duct

s whe

re ri

gid

duct

s hav

e be

en sp

ecifi

ed.




Tab

le 7

: Sys

tem

4 in

stal

lati

on

gu

idel

ines

(co

nti

nu

ed)

Inst

alla

tio

n c

lau

ses

Sup

ple

men

tary

info

rmat

ion

2.0

Du

ctw

ork

(c

on

tin

ued

)

a.

Duc

ts w

ithin

the

build

ing

heat

ed e

nvel

ope

carr

ying

col

d ai

r bet

wee

n th

e ex

tern

al su

pply

/dis

char

ge te

rmin

als a

nd th

e fa

n un

it sh

ould

be

insu

late

d an

d w

rapp

ed a

dditi

onal

ly w

ith a

vap

our b

arrie

r out

side

the

insu

latio

n to

pre

vent

co

nden

satio

n oc

curr

ing

with

in th

e in

sula

tion

mat

eria

l.b.

H

oriz

onta

l duc

ting,

incl

udin

g du

ctin

g in

wal

ls, s

houl

d be

arr

ange

d to

slop

e sl

ight

ly d

ownw

ards

aw

ay fr

om th

e fa

n to

pre

vent

bac

kfl o

w o

f any

moi

stur

e in

to th

e pr

oduc

t.c.

Ve

rtic

al d

uctin

g w

ill re

quire

a c

onde

nsat

e tr

ap in

ord

er to

pre

vent

bac

kfl o

w

of a

ny m

oist

ure

into

the

prod

uct.

d.

Perf

orat

ed in

sula

ted

fl exi

duc

t, u

sed

to m

inim

ise

airb

orne

aco

ustic

tr

ansm

issi

on, s

houl

d no

t be

used

bet

wee

n th

e fa

n un

it an

d ex

tern

al

disc

harg

e te

rmin

al to

pre

vent

con

dens

atio

n oc

curr

ing

with

in th

e in

sula

tion

mat

eria

l.e.

W

here

duc

twor

k pe

netr

ates

a b

uild

ing’

s air

barr

ier,

iden

tify

on b

uild

ing

draw

ings

and

ens

ure

that

con

tinui

ty o

f bar

rier i

s mai

ntai

ned.

f.

Whe

re d

ucts

pas

s thr

ough

fi re

bar

riers

, the

y m

ust b

e ap

prop

riate

ly fi

re

stop

ped

in a

ccor

danc

e w

ith th

e re

quire

men

ts o

f Par

t B o

f the

Bui

ldin

g Re

gula

tions

(Fire

safe

ty).

Inst

alla

tio

n o

f du

cts

– ri

gid

a.

Duc

ts sh

ould

not

be

inst

alle

d w

here

they

can

be

dam

aged

, for

exa

mpl

e ac

ross

ope

n lo

ft a

reas

whe

re th

ey m

ay b

e st

ood

on o

r hav

e ite

ms p

lace

d on

th

em, b

reak

ing

seal

s and

pos

sibl

y cr

ushi

ng th

e du

ct.

b.

Con

nect

ion

of c

ompo

nent

s sho

uld

not r

esul

t in

sign

ifi ca

nt a

ir fl o

w

resi

stan

ce. C

ompo

nent

s sho

uld

be p

ropr

ieta

ry a

nd fi

t eas

ily to

geth

er

with

out d

isto

rtio

n.c.

Ri

gid

duct

runs

mus

t be

adeq

uate

ly su

ppor

ted.

Dist

ortio

n of

rect

angu

lar d

uct m

ay

resu

lt in

sign

ifi ca

nt re

duct

ion

of

the

free

inte

rnal

are

a of

the

duct

, in

crea

sing

the

fl ow

resis

tanc

e an

d m

akin

g se

alin

g m

ore

diffi

cul

t.




Tab

le 7

: Sys

tem

4 in

stal

lati

on

gu

idel

ines

(co

nti

nu

ed)

Inst

alla

tio

n c

lau

ses

Sup

ple

men

tary

info

rmat

ion

2.0

Du

ctw

ork

(c

on

tin

ued

)

Inst

alla

tio

n o

f du

cts

– fl

exib

lea.

D

ucts

shou

ld n

ot b

e in

stal

led

whe

re th

ey c

an b

e da

mag

ed, f

or e

xam

ple

acro

ss o

pen

loft

are

as w

here

they

may

be

stoo

d on

or h

ave

item

s pla

ced

on

them

, cru

shin

g th

e du

ct a

nd re

stric

ting

or p

reve

ntin

g al

l air

fl ow

thro

ugh

the

duct

.b.

Fl

exib

le d

uct s

houl

d be

pul

led

taug

ht to

ens

ure

that

the

full

inte

rnal

dia

met

er

is o

btai

ned

and

fl ow

resi

stan

ce m

inim

ised

. Thi

s is c

onsi

dere

d to

hav

e be

en

achi

eved

if th

e du

ct is

ext

ende

d to

90

per c

ent o

f its

max

imum

leng

th.

c.

Flex

ible

duc

twor

k sh

ould

be

supp

orte

d at

suita

ble

inte

rval

s to

min

imis

e sa

ggin

g.d.

Be

nds i

n fl e

xibl

e du

ct sh

ould

hav

e a

min

imum

insi

de ra

dius

equ

al to

the

diam

eter

of t

he d

uct –

see

Dia

gram

1. I

f tig

hter

ben

ds a

re re

quire

d, ri

gid

bend

s sho

uld

be u

sed.

It is

sugg

este

d th

at fl

exib

le d

ucts

sh

ould

be

supp

orte

d at

inte

rval

s not

ex

ceed

ing

600

mm

.

Du

ct c

on

nec

tio

ns

a.

All

duct

con

nect

ions

requ

ire se

alin

g. W

here

duc

ts a

re in

stal

led

agai

nst a

so

lid st

ruct

ure

this

can

be

diffi

cult

to a

chie

ve. I

n su

ch lo

catio

ns p

reas

sem

bly

of d

uct s

ectio

ns sh

ould

be

cons

ider

ed. T

his w

ill re

quire

that

con

nect

ions

are

pe

rman

ent t

o en

sure

the

seal

is m

aint

aine

d du

ring

inst

alla

tion.

b.

Whe

re a

cces

s to

duct

s will

not

be

poss

ible

aft

er c

onst

ruct

ion

is c

ompl

ete,

i.e

. with

in fl

oor a

nd w

all v

oids

, con

side

ratio

n sh

ould

be

give

n to

per

man

ent

conn

ectio

n an

d se

alin

g w

ith a

n ap

prop

riate

non

-har

deni

ng se

alan

t, a

nd n

ot

usin

g du

ct ta

pe to

ach

ieve

con

nect

ion

and

seal

ing.

c.

Con

nect

ion

of le

ngth

s of fl

exi

ble

duct

mus

t use

a ri

gid

conn

ecto

r and

jubi

lee

clip

s or s

imila

r to

ensu

re a

long

term

seal

is a

chie

ved.

Con

nect

ions

of l

engt

hs

of fl

exib

le d

uct s

houl

d no

t be

tape

d-on

ly.




Tab

le 7

: Sys

tem

4 in

stal

lati

on

gu

idel

ines

(co

nti

nu

ed)

Inst

alla

tio

n c

lau

ses

Sup

ple

men

tary

info

rmat

ion

3.0

Inte

rnal

ve

nti

lati

on

air

tr

ansf

er

Air

tran

sfer

a.

To e

nsur

e go

od tr

ansf

er o

f air

thro

ugho

ut th

e dw

ellin

g, th

ere

shou

ld b

e an

un

derc

ut o

f min

imum

are

a 76

00 m

m2 i

n al

l int

erna

l doo

rs a

bove

the

fl oor

fi n

ish.

Thi

s is e

quiv

alen

t to

an u

nder

cut o

f 10

mm

for a

stan

dard

760

mm

w

idth

doo

r.b.

En

sure

that

the

air t

rans

fer p

rovi

sion

is u

nres

tric

ted

afte

r fl o

or fi

nish

es h

ave

been

laid

(e.g

. car

pets

shou

ld n

ot e

ncro

ach)

. Thi

s sho

uld

be a

chie

ved

by

mak

ing

an u

nder

cut o

f 10

mm

abo

ve th

e fl o

or fi

nish

if th

e fl o

or fi

nish

is

fi tte

d, o

r by

a 20

mm

und

ercu

t abo

ve th

e fl o

orbo

ards

, or o

ther

surf

ace,

if

the

fi nis

h ha

s not

bee

n fi t

ted.

Ad

dit

ion

al n

ote

s fo

r SR

HRV

a.

Free

air

mov

emen

t bet

wee

n ro

oms i

s not

requ

ired

as e

ach

room

con

tain

s a

sing

le ro

om h

eat r

ecov

ery

vent

ilato

r (SR

HRV

) uni

t. T

hese

uni

ts h

ave

a ba

lanc

ed su

pply

and

ext

ract

air

fl ow

rate

. It i

s how

ever

reco

mm

ende

d th

at

the

prov

isio

ns in

3a.

and

3b.

are

mai

ntai

ned

to m

inim

ise

any

imba

lanc

e of

fl o

ws w

ithin

room

s.

4.0

Ro

om

su

pp

ly

and

ext

ract

air

te

rmin

als/

gri

lles

Sup

ply

an

d e

xtra

ct te

rmin

als/

gri

lles

– g

ener

al n

ote

sa.

A

ll ro

om a

ir ex

trac

t ter

min

als s

houl

d be

inst

alle

d as

det

aile

d by

the

syst

em

desi

gner

.b.

Ro

om a

ir ex

trac

t ter

min

als s

houl

d be

inst

alle

d as

clo

se to

cei

ling

leve

l as

prac

tical

, to

ensu

re w

arm

moi

st a

ir is

rem

oved

from

eac

h sp

ace.

c.

Room

supp

ly a

ir te

rmin

als m

ust n

ot b

e lo

cate

d ad

jace

nt to

wal

ls, u

nles

s de

sign

ed to

dis

char

ge a

ir aw

ay fr

om th

e w

all,

as th

is m

ay re

sult

in d

own

drau

ghts

.d.

In

ope

n pl

an a

reas

whe

re b

oth

supp

ly a

nd e

xtra

ct te

rmin

als m

ay b

e in

stal

led,

e.

g. k

itche

n di

ners

, the

term

inal

s sho

uld

be a

dequ

atel

y se

para

ted

to e

nsur

e sh

ort c

ircui

ting

is m

inim

ised

.e.

Th

e nu

mbe

r and

loca

tion

of te

rmin

als i

nsta

lled

in a

spac

e sh

ould

ens

ure

effe

ctiv

e ai

r dis

trib

utio

n an

d en

sure

that

air

nois

e is

not

a n

uisa

nce

whe

n th

e sy

stem

is o

pera

ting

at b

oost

air

fl ow

rate

s.




Tab

le 7

: Sys

tem

4 in

stal

lati

on

gu

idel

ines

(co

nti

nu

ed)

Inst

alla

tio

n c

lau

ses

Sup

ple

men

tary

info

rmat

ion

4.0

Ro

om

su

pp

ly

and

ext

ract

air

te

rmin

als/

gri

lles

(co

nti

nu

ed)

Fixe

d te

rmin

als

– g

rille

s o

r lo

uve

rsa.

If

the

supp

ly a

nd e

xtra

ct a

ir te

rmin

als a

re fi

xed,

ens

ure

that

eff

ectiv

e ba

lanc

ing

of th

e sy

stem

can

be

achi

eved

. If a

faci

lity

is n

ot p

rovi

ded

with

in

the

fan

unit

then

dam

pers

shou

ld b

e in

stal

led

with

in th

e du

ct sy

stem

to

allo

w b

alan

cing

whe

n th

e sy

stem

is c

omm

issi

oned

.

Ad

just

able

term

inal

s/g

rille

sa.

En

sure

eac

h te

rmin

al/g

rille

can

be

lock

ed in

its c

omm

issi

oned

pos

ition

onc

e sy

stem

bal

ance

has

bee

n ac

hiev

ed. I

t is v

ital f

or th

e co

rrec

t ope

ratio

n of

the

syst

em th

at th

e sy

stem

rem

ains

bal

ance

d in

its c

omm

issi

oned

stat

e.

5.0

Exte

rnal

d

isch

arg

e te

rmin

al

MV

HR

Exte

rnal

su

pp

ly a

nd

d

isch

arg

e te

rmin

al

Sup

ply

an

d d

isch

arg

e te

rmin

als

– ro

of a

nd

wal

l mo

un

ted

a.

Prop

rieta

ry te

rmin

als s

houl

d be

use

d.b.

En

sure

that

the

free

are

a of

the

term

inal

ope

ning

is a

min

imum

of 9

0 pe

r ce

nt o

f the

free

are

a of

the

duct

ing

bein

g us

ed.

c.

The

loca

tion

of th

e ex

tern

al d

isch

arge

term

inal

shou

ld e

nsur

e th

at th

e po

tent

ial f

or re

circ

ulat

ion

of e

xtra

ct a

ir th

roug

h th

e su

pply

air

term

inal

is

min

imis

ed.

It is

reco

mm

ende

d th

at th

e su

pply

and

ex

trac

t air

term

inal

s are

sepa

rate

d by

a

min

imum

of 3

00 m

m h

oriz

onta

lly

if pl

aced

on

the

sam

e fa

çade

of a

bu

ildin

g.




Tab

le 7

: Sys

tem

4 in

stal

lati

on

gu

idel

ines

(co

nti

nu

ed)

Inst

alla

tio

n c

lau

ses

Sup

ple

men

tary

info

rmat

ion

6.0

Co

ntr

ols

Co

ntr

ols

– g

ener

al n

ote

sa.

C

ontin

uous

ven

tilat

ion

syst

ems s

houl

d no

t allo

w th

e oc

cupi

er to

turn

off

the

fan

othe

r tha

n at

the

loca

l iso

lato

r. Pr

ovis

ion

of a

n on

/off

func

tion

will

resu

lt in

the

fans

bei

ng o

pera

ted

inte

rmitt

ently

and

the

requ

ired

cont

inuo

us a

ir fl o

w v

entil

atio

n ra

tes n

ot b

eing

ach

ieve

d.b.

W

here

sens

ors a

re n

ot p

re-in

stal

led

with

in th

e fa

n un

it, o

r add

ition

al

optio

nal s

enso

rs c

an b

e in

stal

led,

onl

y th

e se

nsor

s spe

cifi e

d by

the

man

ufac

ture

r of t

he fa

n un

it sh

ould

be

inst

alle

d.c.

If

sens

ors a

re d

uct m

ount

ed, t

heir

loca

tion

shou

ld b

e no

ted

and

prov

isio

n fo

r ac

cess

for m

aint

enan

ce o

r rep

lace

men

t mad

e.d.

If

cont

rol o

f the

fan

spee

d is

und

erta

ken

man

ually

, the

ope

ratio

n of

the

fan

in b

oost

mod

e sh

ould

be

mad

e ob

viou

s. T

his w

ill m

inim

ise

the

likel

ihoo

d of

it

bein

g le

ft in

this

mod

e un

nece

ssar

ily.

e.

Hum

idity

con

trol

shou

ld n

ot b

e th

e on

ly c

ontr

ol u

sed

in sa

nita

ry

acco

mm

odat

ion,

whe

re o

dour

is th

e m

ain

pollu

tant

.

Inst

alla

tion

of a

ltern

ativ

e se

nsor

s m

ay re

sult

in c

ontr

ol fu

nctio

ns n

ot

perf

orm

ing

corr

ectly

.

Co

ntr

ols

– lo

cati

on

an

d c

on

fi g

ura

tio

na.

In

stal

latio

n of

man

ual c

ontr

ols f

or th

e sy

stem

mus

t mee

t the

requ

irem

ents

of

Par

t M o

f the

Bui

ldin

g Re

gula

tions

.b.

In

stal

latio

n of

room

sens

ors s

houl

d fo

llow

the

man

ufac

ture

r’s g

uida

nce

on

posi

tioni

ng.

c.

Whe

re c

ontr

ol o

f the

fan

spee

d is

und

erta

ken

man

ually

, sw

itchi

ng sh

ould

be

pro

vide

d lo

cally

to th

e sp

aces

bei

ng se

rved

, i.e

. bat

hroo

ms a

nd k

itche

n.

Prov

isio

n of

a si

ngle

cen

tral

ly lo

cate

d sw

itch

is n

ot su

ffi ci

ent a

nd w

ill re

sult

in

fans

bei

ng le

ft in

inap

prop

riate

mod

es o

f ope

ratio

n.

App

rove

d D

ocum

ent M

, Sec

tion

8.3,

re

com

men

ds th

at sw

itche

s sho

uld

be lo

cate

d be

twee

n 45

0 m

m a

nd

1200

mm

from

fi ni

shed

fl oo

r lev

el.




Tab

le 7

: Sys

tem

4 in

stal

lati

on

gu

idel

ines

(co

nti

nu

ed)

Inst

alla

tio

n c

lau

ses

Sup

ple

men

tary

info

rmat

ion

7.0

Sin

gle

roo

m

hea

t rec

ove

ry

ven

tila

tor

(SR

HRV

) d

evic

es

Ven

tila

tio

n o

f wh

ole

bu

ildin

ga.

Th

ese

prod

ucts

pro

vide

bal

ance

d ve

ntila

tion

for o

ne ro

om o

nly;

the

vent

ilatio

n of

all

spac

es sh

ould

mee

t the

requ

irem

ents

of t

he B

uild

ing

Regu

latio

ns.




Tab

le 8

: Sys

tem

4 in

spec

tio

n, t

esti

ng

an

d c

om

mis

sio

nin

g

Rec

om

men

ded

min

imu

m re

qu

irem

ents

Sup

ple

men

tary

info

rmat

ion

1.0

Syst

em

ove

rvie

w

Vis

ual

insp

ecti

on

sC

arry

out

the

follo

win

g ch

ecks

and

reco

rd th

e re

sults

in S

ectio

n 5:

a.

Doe

s the

syst

em in

stal

latio

n co

mpl

y w

ith th

e in

stal

latio

n cl

ause

s in

Tabl

e 7?

b.

Is th

e sy

stem

inst

alle

d in

acc

orda

nce

with

des

ign

crite

ria?

c.

Is a

ll du

ctw

ork

and

are

all t

erm

inal

s in

good

con

ditio

n w

ith n

o ob

viou

s de

fect

s tha

t will

be

haza

rdou

s or a

ffec

t the

syst

em p

erfo

rman

ce?

Init

ial s

tart

-up

a.

Is th

e ai

r fl o

w d

irect

ion

corr

ect a

t eac

h ro

om te

rmin

al, s

uppl

y an

d ex

trac

t?b.

A

re th

ere

any

abno

rmal

noi

ses o

n st

art-

up o

r whe

n th

e sy

stem

is ru

nnin

g in

no

rmal

bac

kgro

und

vent

ilatio

n m

ode?

Som

e fa

n un

its h

ave

a st

art-

up d

iagn

ostic

se

quen

ce th

at ru

ns th

e fa

ns a

t max

imum

sp

eed

for a

per

iod

befo

re re

vert

ing

to n

orm

al

oper

atio

n –

refe

r to

the

man

ufac

ture

r’s

oper

atin

g in

stru

ctio

ns.




Tab

le 8

: Sys

tem

4 in

spec

tio

n, t

esti

ng

an

d c

om

mis

sio

nin

g (c

on

tin

ued

)

Min

imu

m re

qu

irem

ents

Sup

ple

men

tary

info

rmat

ion

2.0

Com

mis

sion

ing:

ai

r fl o

w

bal

anci

ng

an

d

mea

sure

men

t

Air

fl o

w b

alan

cin

ga.

Th

e sy

stem

shou

ld b

e ba

lanc

ed to

ens

ure

that

des

ign

air fl

ow

rate

s are

ac

hiev

ed a

t eac

h ro

om te

rmin

al/g

rille

. As t

here

are

seve

ral c

ombi

natio

ns

of ro

om te

rmin

al/g

rille

and

fan

cont

rol t

hat m

ay b

e us

ed in

dom

estic

sy

stem

s, th

e fa

n m

anuf

actu

rer’s

inst

ruct

ions

shou

ld b

e fo

llow

ed to

ach

ieve

ba

lanc

ing.

If sp

ecifi

c de

tails

are

not

incl

uded

the

follo

win

g pr

oced

ure

shou

ld

be a

dopt

ed:

i. A

dju

stab

le te

rmin

als

and

a fi

xed

(ste

pp

ed) s

pee

d fa

n.

Th

e fa

n sp

eed

shou

ld b

e se

t to

achi

eve

the

desi

red

cont

inuo

us fl

ow ra

te.

The

inde

x te

rmin

al fl

ow ra

te is

set t

o fu

lly o

pen

and

all o

ther

term

inal

s ar

e ad

just

ed to

ach

ieve

the

requ

ired

fl ow

s at e

ach

term

inal

.If

the

tota

l fl o

w ra

te c

anno

t be

achi

eved

thro

ugh

all t

he te

rmin

als t

hen

the

fan

spee

d sh

ould

be

incr

ease

d.

If al

l the

term

inal

s hav

e to

be

clos

ed si

gnifi

cant

ly to

ach

ieve

onl

y th

e re

quire

d ai

r fl o

w ra

te th

en re

duce

the

fan

spee

d an

d re

bala

nce

the

term

inal

s.ii.

A

dju

stab

le te

rmin

als

and

co

ntr

olla

ble

sp

eed

fan

.

The

fan

spee

d sh

ould

be

set a

ppro

xim

atel

y to

ach

ieve

the

desi

red

cont

inuo

us fl

ow ra

te.

The

inde

x te

rmin

al fl

ow ra

te is

set w

ith th

e te

rmin

al fu

lly o

pen

and

all o

ther

term

inal

s are

adj

uste

d to

ach

ieve

the

requ

ired

fl ow

s at e

ach

term

inal

.If

the

inde

x te

rmin

al h

as to

be

clos

ed to

ach

ieve

onl

y th

e re

quire

d ai

r fl o

w ra

te, t

hen

redu

ce th

e fa

n sp

eed

and

reba

lanc

e th

e te

rmin

als.

No

te: T

his

is th

e ap

pro

ved

pro

ced

ure

fo

r co

mm

issi

on

ing

as

req

uir

ed b

y th

e B

uild

ing

Reg

ula

tio

ns.

The

inde

x te

rmin

al/g

rille

can

be

assu

med

to

be th

e te

rmin

al fu

rthe

st fr

om th

e fa

n un

it.




Tab

le 8

: Sys

tem

4 in

spec

tio

n, t

esti

ng

an

d c

om

mis

sio

nin

g (c

on

tin

ued

)

Min

imu

m re

qu

irem

ents

Sup

ple

men

tary

info

rmat

ion

2.0

Com

mis

sion

ing:

ai

r fl o

w

bal

anci

ng

an

d

mea

sure

men

t (c

on

tin

ued

)

iii.

Fixe

d te

rmin

als

wit

h fl

ow

ad

just

men

t by

du

ct d

amp

er o

r sim

ilar

dev

ice

at th

e fa

n u

nit

.A

s i. o

r ii.

abov

e de

pend

ing

on th

e ty

pe o

f fan

spee

d co

ntro

l.iv

. A

dju

stab

le te

rmin

als

and

fi xe

d v

olu

me

fl o

w fa

n.

Th

e fa

n sp

eed

shou

ld b

e se

t to

achi

eve

the

desi

red

cont

inuo

us fl

ow ra

te.

The

inde

x te

rmin

al fl

ow ra

te is

set w

ith th

e te

rmin

al fu

lly o

pen

and

all o

ther

term

inal

s are

adj

uste

d to

ach

ieve

the

requ

ired

fl ow

s at e

ach

term

inal

. Adj

ustm

ent o

f the

term

inal

s ach

ieve

s bal

anci

ng o

nly;

tota

l fl o

w ra

te is

gov

erne

d by

the

fan

cont

rol s

ettin

g. G

reat

car

e sh

ould

be

take

n no

t to

clos

e th

e te

rmin

als t

oo fa

r as t

he fa

n un

it w

ill a

lway

s m

aint

ain

a co

nsta

nt v

olum

etric

fl ow

rate

; clo

sing

the

term

inal

s will

onl

y re

quire

the

fan

to w

ork

hard

er to

ach

ieve

a g

iven

air

fl ow

rate

.v.

Fi

xed

term

inal

s w

ith

au

tom

atic

fl o

w a

dju

stm

ent a

t th

e fa

n u

nit

.

The

fan

spee

d sh

ould

be

set t

o ac

hiev

e th

e de

sire

d co

ntin

uous

fl ow

rate

.Th

e fl o

ws a

re b

alan

ced

by a

utom

atic

dev

ices

loca

ted

with

in th

e fa

n un

it,

and

no a

djus

tmen

t can

be

mad

e.




Tab

le 8

: Sys

tem

4 in

spec

tio

n, t

esti

ng

an

d c

om

mis

sio

nin

g (c

on

tin

ued

)

Min

imu

m re

qu

irem

ents

Sup

ple

men

tary

info

rmat

ion

2.0

Com

mis

sion

ing:

ai

r fl o

w

bal

anci

ng

an

d

mea

sure

men

t (c

on

tin

ued

)

Air

fl o

w m

easu

rem

ents

a.

Ensu

re a

ll in

tern

al a

nd e

xter

nal d

oors

and

win

dow

s are

clo

sed,

incl

udin

g ro

oms i

n w

hich

mea

sure

men

ts a

re b

eing

car

ried

out.

b.

Air

fl ow

mea

sure

men

ts sh

ould

be

perf

orm

ed u

sing

a c

alib

rate

d ai

r fl o

w

devi

ce w

ith p

ropr

ieta

ry h

ood

atta

chm

ent a

nd re

sults

reco

rded

in li

tres

per

se

cond

(l/s

). Re

fere

nce

shou

ld b

e m

ade

to d

esig

n ai

r fl o

w ra

tes.

c.

Reco

rd th

e ai

r fl o

w ra

te a

t eac

h ro

om te

rmin

al o

n th

e co

mm

issi

onin

g sh

eet i

n Se

ctio

n 5,

alo

ng w

ith th

e de

sign

air

fl ow

rate

for e

ach

term

inal

. M

easu

rem

ents

shou

ld b

e ta

ken

at b

oth

max

imum

rate

and

min

imum

rate

fa

n sp

eeds

.d.

It

is re

com

men

ded

that

a v

ane

anem

omet

er o

r sim

ilar d

evic

e is

use

d to

bal

ance

and

mea

sure

the

air fl

ow

rate

s at e

ach

room

term

inal

. The

in

stru

men

t will

requ

ire a

hoo

d to

be

atta

ched

to a

llow

it to

cov

er th

e te

rmin

al.

e.

The

inst

rum

ent s

houl

d be

cal

ibra

ted

annu

ally

and

be

capa

ble

of a

chie

ving

an

acc

urac

y of

± 5

per

cen

t.A

dd

itio

nal

no

tes

for S

RH

RVa.

Th

e su

pply

and

ext

ract

con

fi gur

atio

n of

som

e fa

n un

its m

ay p

reve

nt

mea

sure

men

t of t

he a

ir fl o

w ra

tes.

In su

ch c

ases

, if t

he m

anuf

actu

rer’s

in

stal

latio

n in

stru

ctio

ns h

ave

been

follo

wed

the

air fl

ow

rate

s spe

cifi e

d fo

r th

at p

rodu

ct m

ust b

e as

sum

ed to

hav

e be

en a

chie

ved.

No

te: T

his

is th

e ap

pro

ved

p

roce

du

re fo

r air

fl o

w

mea

sure

men

t as

req

uir

ed b

y th

e B

uild

ing

Reg

ula

tio

ns.

Cal

ibra

tion

of m

easu

rem

ent

equi

pmen

t sho

uld

be u

nder

take

n an

nual

ly b

y re

turn

ing

the

inst

rum

ent

to a

UK

AS

accr

edite

d ca

libra

tion

cent

re.




Tab

le 8

: Sys

tem

4 in

spec

tio

n, t

esti

ng

an

d c

om

mis

sio

nin

g (c

on

tin

ued

)

Rec

om

men

ded

min

imu

m re

qu

irem

ents

Sup

ple

men

tary

info

rmat

ion

3.0

Co

ntr

ols

Inst

alla

tio

na.

En

sure

all

loca

l con

trol

s hav

e be

en in

stal

led

follo

win

g th

e m

anuf

actu

rer’s

in

stru

ctio

ns.

b.

Ensu

re a

ll lo

cal c

ontr

ols a

re a

dequ

atel

y la

belle

d, in

dica

ting

thei

r fun

ctio

n cl

early

.c.

If

sens

ors h

ave

been

inst

alle

d se

para

tely

from

the

fan

unit,

ens

ure

the

inst

alla

tion

follo

ws t

he m

anuf

actu

rer’s

inst

ruct

ions

.d.

W

here

con

trol

of t

he fa

n is

aut

omat

ed, t

he c

ontr

ols s

houl

d be

con

fi gur

ed to

m

inim

ise

the

occu

rren

ce o

f hun

ting.

e.

If m

anua

l con

trol

of,

for e

xam

ple,

hea

t exc

hang

er b

y-pa

ss is

pro

vide

d, c

lear

an

d de

taile

d in

stru

ctio

ns sh

ould

be

mad

e av

aila

ble

to th

e oc

cupi

er.

If hu

ntin

g (th

e co

ntin

ual i

ncre

ase

and

decr

ease

of t

he fa

n sp

eed)

doe

s oc

cur,

occu

pant

s may

seek

to m

odify

th

e co

ntro

l of t

he sy

stem

or t

urn

it of

f alto

geth

er to

rem

ove

the

noise

nu

isanc

e.

Test

ing

op

erat

ion

a.

As f

ar a

s pra

ctic

al th

e co

rrec

t ope

ratio

n of

eac

h co

ntro

l fun

ctio

n sh

ould

be

test

ed.



Section 4 System completion and handover | 53

Section 4

System completion and handover

This section outlines the recommended minimum information to be handed over to the end user immediately after the ventilation system has been installed, tested and commissioned, as appropriate to the system type.

4.1 Documentation to be handed over to the end user

Operation and maintenance manualThe operation and maintenance manual should contain specifi c instructions for the end user on how and when to use the ventilation system, including information on the intended use of available fan settings. Information should also be provided to suggest when the system components should be cleaned and maintained.

The following information should be provided where relevant:

• design statement that sets out the key characteristics of the system provided along with specifi c, non-technical information on how and when the system should be used

• manufacturer’s contact details

• use of air inlets for background ventilation

• location of and setting automatic controls (e.g. humidity and timer controls)

• location and use of on/off and boost settings for mechanical ventilation system

• adjustable extract air terminals on vertical PSV ducts

• instructions on how cleaning and maintenance should be carried out, including replacing fi lters

• location of fi lters if not installed within the fan unit

• if there are no fi lters on extract terminals, how ducts can be accessed for cleaning, and recommendations on how and when cleaning should be undertaken

• recalibration or checking of sensors and their location.




The operation and maintenance manual should also contain relevant manufacturers’ literature which was supplied with the system or with individual components of the system. This might include component specifi cations, installation guidance, operating instructions, maintenance schedules, guarantees, registration card, spare part lists, means of obtaining spare parts, etc.

Completion of inspection checklist and air fl ow measurement test sheetThe three-part sheet detailed in Section 5 should be signed and completed and included in the Operation and Maintenance manual.



Section 5 Inspection checklist and air fl ow measurement test sheet | 55

Section 5

Inspection checklist and air fl ow measurement test sheet

This inspection checklist and air fl ow measurement test sheet is divided into three parts:

• Part 1 is for recording the particulars of the system, the installation address and the installer’s details.

• Part 2a functions as an installation checklist.

• Part 2b is for recording the results of a visual inspection of the installation, and also acts as a pre-test checklist.

• Part 3 is the approved manner for recording the results of mandatory air fl ow tests on both intermittent and continuous mechanical ventilation systems in new dwellings, and is the sheet that must be given to the building control body (BCB).

The three parts should be completed in full, and a copy should form part of the Operation and Maintenance manual.

5.1 Checking design against measured air fl ow rates

For Systems 1, 3 and 4, the measured air fl ow rates should be recorded on Part 3: Air fl ow measurement test details, as part of the testing and commissioning procedures given in Tables 2, 6 and 8. The measured values will need to be compared with their respective design values. Compliance with the design will be met if the measured air fl ow rates for each are equal to, or greater than the design value. If any measured value is less than the design value, adjustment should be made to correct the system and all air fl ows re-measured until they meet the design values. If it is not possible to make adjustment to increase the air fl ow rate then a note to this effect should be made on the sheet. This may require the person with overall responsibility for the system to carry out remedial works to rectify the cause of the under-performance. The system will need to be re-tested to confi rm that the design values have been met.




5.2 Instrument calibration

Measurement of air fl ows should be performed using equipment that has been calibrated at a UKAS accredited calibration centre. Calibration should be performed annually for each air fl ow measurement device used to record fi nal air fl ow rates in Part 3.

5.3 Demonstrating compliance

All three parts of the checklist and test sheet should be completed, with the relevant Parts 2 and 3 signed by a person who is responsible for the inspection and testing of the system that has been installed.

The three-part form needs to be completed for each installation address, and as a minimum a copy of Part 3 should be submitted to the BCB as evidence the installation has been correctly tested and commissioned (as relevant to the system installed).




Part 1 – System details and declarations

1.1 Installation Address Details

Dwelling name/number

Street

Locality

Town

County

Post Code

1.2 Installation Details

System classifi cation* System ......

Enter System 1 to 4 as defi ned by Approved Document F 2010

Manufacturer

Model numbers

Serial number (where available)

Location of fan units 1.

2.

3.

4.

5.

*Note. If a system has been installed that is not defi ned by Systems 1 to 4 in Approved Document F, further installation checks and commissioning procedures may be required. Seek particular guidance from the manufacturer for these systems.




Part 2a – Installation details

2.1 Installation Checklist – General (all Systems) Tick as appropriate

Has the system been installed in accordance with manufacturer’s requirements?

Yes No

Have relevant system installation clauses been followed as detailed in Tables 1, 3, 5, and 7 as applicable?

Yes No

Type of ductwork installed (e.g. rigid, semi-rigid)

If any deviation from Tables 1, 3, 5 and 7, these should be detailed here

Description of installed controls (e.g. timer, central control, humidistat, PIR, etc)

Location of manual/override controls

2.2 Installation Engineer’s Details

Name

Company

Address Line 1

Address Line 2

Telephone Number

Post Code

Signature

Competent Person Scheme/ Registration Number (if applicable)

Date of Installation (completion)




Part 2b – Inspection of installationThis section should be completed before completing Part 3.

2.3a Visual Inspections – General (all Systems)

Total installed equivalent area of background ventilators in dwelling?

mm

Total fl oor area of dwelling? m2

Does the total installed equivalent ventilator area meet the requirements given in Tables 5.2a, 5.2b, or 5.2c in ADF?

Yes No

Have all background ventilators been left in the open position? Yes No

Have the correct number and location of extract fans/terminals been installed that satisfy Table 5.2a in ADF?

Yes No

Is the installation complete with no obvious defects present? Yes No

Do all internal doors have suffi cient undercut to allow air transfer between rooms (i.e. 10 mm over and above fi nal fl oor fi nish)?

Yes No

Has all protection/packaging been removed (including from background ventilators) such that system is fully functional?

Yes No

For ducted systems, has the ductwork installation been installed in such manner that air resistance and leakage is kept to a minimum?

Yes No

Are the correct number and size of background ventilators provided that satisfy ADF?

Yes No

Has the entire system been installed such that there is suffi cient access for routine maintenance and repair/replacement of components?

Yes No

2.3b Visual Inspections – General (Systems 3 and 4 only)

Have appropriate air terminal devices been installed to allow system balance?

Yes No

Has the heat recovery unit (System 4 only) and all ductwork been effectively insulated where installed in unheated spaces?

Yes No

Condensate connection is complete and drains to an appropriate location (System 4 only)?

Yes No

2.3c Other Inspections – General (Systems 1, 3 and 4 only)

Upon initial start up, was any abnormal sound or vibration experienced, or unusual smells detected?

Yes No




2.3d Inspector’s Details

Name

Company

Address Line 1

Address Line 2

Telephone Number

Post Code

Signature

Competent Person Scheme/ Registration Number (if applicable)

Date of Inspection (completion)




Part 3 – Air fl ow measurement test and commissioning details

3.1 Test Equipment

Schedule of air fl ow measurement equipment used (model and serial number)

Date of last UKAS calibration

1.

2.

3.

3.2 Air Flow Measurements – System 1 only

Fan Reference (as 1.2)

Measured Extract Rate (l/s) Design Extract Rate (l/s) Refer to Table 5.1a in ADF

Extract Fan 1

Extract Fan 2

Extract Fan 3

Extract Fan 4

Extract Fan 5

For kitchen extract canopies, only the highest setting needs to be recorded.

3.3 Air Flow Measurements (Extract) – Systems 3 and 4 only

Room Reference (location of terminals)

Measured Air FlowHigh Rate (l/s)

Design Air FlowHigh Rate (l/s)

Measured Air FlowLow Rate (l/s)

Design Air FlowLow Rate (l/s)

Kitchen

Bathroom

En Suite

Utility

Other...

Other...

Other...




3.4 Air Flow Measurements (Supply) – System 4 only

Room Reference (location of terminals)

Measured Air FlowHigh Rate (l/s)

Design Air FlowHigh Rate (l/s)

Measured Air FlowLow Rate (l/s)

Design Air FlowLow Rate (l/s)

Living Room 1

Living Room 2 (if present)

Dining Room

Bedroom 1

Bedroom 2

Bedroom 3

Bedroom 4

Bedroom 5

Study

Other...

3.5 Commissioning – Systems 3 and 4 only

Have controls been set-up in accordance with the manufacturer’s recommendations?

Yes No

Have all distribution grilles been locked to prevent unauthorised adjustment?

Yes No

3.6 Test Engineer’s Details

Name

Company

Address Line 1

Address Line 2

Telephone Number

Post Code

Signature

Competent Person Scheme/Registration Number (if applicable)

Date of Test



Published by NBS, part of RIBA Enterprises Ltd, and available from:

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ISBN 978-1859463789

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