technical data prihoda

8/10/2019 Technical Data PRIHODA

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FABRICDUCTING&DIFFUSE

Technical data

Tailor-made Air Ducting&Diffusers

English version


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Contents1.OPERATION OF FABRIC DUCTING & DIFFUSERS1.1. Air outlet from a diffuser 1.2. Air entry into negative pressure (extract) ducting1.3. Air transfer ducting2. PRIMARY CHARACTERISTICS OF PRIHODA PRODUCTS2.1. Cross section2.2. Dimension2.3. Length2.4. Pressure 2.5. Type of Endings

3. INSTALLATION4. SPECIFICATION5. DESIGN FEATURES5.1. Membrane Diffuser5.2. Negative Pressure (Extract) Ducting5.3. Insulated Ducting5.4. Adjustable Length Fabric Duct5.5. Adjustable Arch

5.6. Nozzles5.7. Tensioners5.8. Reinforcing components5.9. Equalisers5.10. Damper5.11. Diffuser for Intensive Cooling 5.12. Air Diffuser Lantern 5.13. Defrost damper 5.14. Antistatic Design 5.15. Moveable Adapter 5.16. Winch 5.17. Other Products6. MATERIAL7. MAINTENANCE AND WARRANTY8. EXAMPLES OF APPLICATIONS9. FREQUENTLY ASKED QUESTIONS10. 5+5+5

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3366778899

1012131314141515

1616171818181920212122232325262931



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Operation of Fabric Ducting & DiffusersPrihoda products are usually acting as both supply air ducting (air transfer) as well as air distribution/diffusion intothe occupied zone. We supply both types of system, (1) positive pressure distribution systems (supply air) and (2)negative pressure (extract /return air) ducting for exhausting air from rooms.

1.

Air outlet from a diffuser1.1.Supply air (see V below) owing into the diffuser through either end or an inlet spigot, can exit the diffuser in anof the following methods:

A - through the permeable fabric materialB - through microperforations either 0.2mm or 0.4 mm laser cut holes in the fabricC - through perforations laser cut holes with a diameter greater than 4 mmD - through fabric nozzles see chapter 5 for more detailsE - through an adapter/outlet spigot air is diverted to another system/areaF- through an outlet end air leads to another system/area

A B C D

V air supply E

air outlet through an adapter/spigot

It always holds true that: V = A + B + C + D + E + F

(certain values of A, B, C, D, E, F may be zero)

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air outletthroughanoutlet end

F



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Fabric Diffusers are a universal air distribution tool and cover the entire range of air delivery patterns. Weachieve the requested air distribution by selecting the correct air outlet method. We can combine the airoutlet methods on a single diffuser duct in any pattern or ratio we wish.

Airow Travel Distance from Fabric Diffusers

Uniformmicroperforation

DirectionalmicroperforationPerforationNozzle

Supply air is delivered through fabric diffusers using almost any diameter of laser cut perforation in any position onthe duct circumference. This combination of any size and position of perforations provides an almost innite numberof design variations. The range of possibilities begins with low velocity diffusion and continues up to long-distanctargeted air supply. Small perforations with a diameter of 0.2 or 0.4 mm, which we refer to as microperforationsare designed mainly for use as low velocity air diffusion. We use a series of 4mm diameter or larger holes, whicwe call perforations, to provide directed air supply. When calculating the air travel distance, the supply air to roomtemperature difference must be considered.

Travel distance varies depending upon available static pressure and temperature difference.

0,2 m/s

0,2 m/s

0,2 m/s

0,2 m/s

1 0

- 3 0 m

3 -

1 2 m

0 - 3

m

0 -

1 , 5

m


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The air velocity at various distances from the diffuser can be calculated by our in house design software which ibeing constantly rened and takes into account all associated design inuences. These include specically, positivepressure in the diffuser, position and dimensions of outlet openings, and temperature difference. In cases where theair velocity cannot be reliably calculated by the software (due to complex interaction of multiple air ows for examplewe can provide these calculations by means of our Fluent software.

Airow patterns created by PRIHODA design software

In general, Prihoda Fabric Diffusers operate at similar air ow velocities to traditional ducting. The maximum spewithin the duct is dictated by aerodynamic noise in relation to the place of use. A further velocity limitation may bneeded due to ow turbulence, which can cause vibration of the fabric. Specic conditions of ow, static pressure andweight of the fabric used must be taken into account.

Examples of airow patterns created using smoke tests in the PRIHODA testing centre

uniform microperforation

directed perforation

directed microperforation

close - up of air outlet from perforation

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Pozice 2 sek 1 Reim vtrn Rozdl teplot 0 C

0,500

0,420

0,330

0,250

0,170

0,080

0,000

m/s

Airow patterns created by Fluent software



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1.2.

1.3.

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Air transfer ducting

Air entry into negative pressure (extract) ducting

Ducting made from impermeable fabric or insulated ducting (see chapter 5.3.) transports air to thedestination WITHOUT diffusion. We have the technical ability to design and manufacture, branches, bendand other ttings for any situation.

Perforations are used to allow extract air into negative pressure ducting.

air outlet through an adapter/spigot

air inlet through perforation

air outlet


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2.2.1.

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Primary characteristics of Prihoda productsCross Section

P O S I T I V E P R E S

S U R E O N L Y

C CIRCULAR The standard shape, easy maintenance,preferentially recommended.

H HALF-ROUND For use where there is not enough spacefor circular diffuser and aesthetic applications.

Q QUARTER-ROUNDFor use where there is not enough space

for circular diffuser, in aesthetic applicationsand if the diffuser is to be installed in thecorner of a room.

SG SEGMENT For use where there is not enough height fora half-round diffuser.

SC SECTOR Available If the room corner constructionrequires a different shape to quarter round.

O V E R

P R E S S U R E A N D

N E G A T I V E P R E S S U R E

S SQUAREThis shape requires a special suspensionstructure (provided) to clamp and support allcorners.

T TRIANGULARThe triangular shape is maintained by placinga heavy weight at the bottom of the duct tomaintain tension on the walls of the material.

We also make fabric transitions to adapt and join different shapes together.

In the case of Square and Triangular ducts the shape partially deforms upon duct ination, due to positivepressure or negative pressure and the exibility of the material.

Half-round diffuser Segment diffuser


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2.2.

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2.3.


Sizes and DiametersWe manufacture fabric ducting and diffusersof all dimensions from 100mm to 2000 mm, eachdesigned to specic requirements. The duct inletsand connection spigots are always manufactured

10-15 mm larger than the specied size/diameter forease of connection.

Standard manufacturing dimensions (other sizes are available):100, 125, 160, 200, 250, 315, 400, 500, 630, 710, 800, 900, 1 000, 1 120, 1 250, 1 400, 1 600, 1 800, 2 000

LengthDetermining the length of Fabric Ducting & Diffusers depends primarily on the availability of space.We can manufacture a fabric diffuser to deliver the same air volume whether the duct is short or long, the precisedesign depends on the material type, perforation designs and system pressure.

CUSTOMARY PARTS & LENGTHS

- Individual parts are connecting with zippers; the number of zippers (or the distance between them) is exible andcan be specied by the customer

- Only the overall length in mm (A + B + C) is provided in the specication, the ducting and diffusers are separated isegments during production.

The ducts have dimensions (A) or (B) depending uponshape, please see the chart above or the table below.

Shape Dimension (values A,B)

Circular diameter (A)half-round diameter (A)quarter-round radius (A)segment width, height (A,B)sector radius (A)square length of edges (A,B)triangular base, height (A,B)

A - Beginning (edge /zip) length 100mm - 200 mmB - Continuous part (zip/zip) length 5000mm 10000 mm, these are multiplied to create the correct

duct lengthC - Blind part (zip/end) length from 100mm to 11000 mm

A B

C


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PressurePressure losses of Fabric Ducting & Diffusers are verysimilar to those in the traditional ducting. Calculatinga more complex fabric distribution system is achievedusing similar methods to those for sheet metal ducting.The minimum static pressure necessary to keep thecorrect shape of a Fabric Duct or Diffuser depends uponthe weight of the fabric used. A minimum of 20 Pa issufficient for light materials and 50 Pa necessary formedium and heavy ones. The pressure distribution alongFabric Diffusers is different from traditional sheet metalducting because with declining airow longitudinalvelocity decreases. To verify the design of your fabricdistribution system, please contact us.

2.4.

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Types of Ending2.5.

F BEGINNING (WITH ZIP) H HEM (WITHOUT ZIP)

WOUT OUTER WING WIN INNER WING

B BLANK END Z ZIP

S STITCHED

100-200 mm


Pressure distribution in a Fabric Diffuser


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3.

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Installation

Installation no. Cross section view Type of suspensionAdditional accessories designation (seeoverview chart below)

0 without mounting material and hooks or enlargedstrips1 wire D, F, K, M

2 wire D, F, K, M

3 prole, velcro A, B, C, G, J, L, H

4 prole B, C, G

5 suspended prole A, B, C, G, I, D, E, F, K, L, M

6 suspended prole A, B, C, G, I, D, E, F, K, L, M

7 tensionerD, F, Hcan be added to all other installationtypes

8proles, velcro A (always used for triangular shapedducts), B, C, G, L, H, J

9 proles A, D, E, F, K, L, M

10 proles A, L

11proles A, E, K, L, M


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hooks aluminium prole plastic coated wire

sectionthrough wire

enlarged strip (A) plastic prole (B) aluminium prole with hangers (C)

wire hangers (D,F) thread bar (E) stainless prole (G)

reinforced aluminium prole (I) Velcro (J) Gripple hangers (M)


Untagged suspension by hooks and aluminium prole or by wireA enlarged strip instead of hooksB plastic proleC aluminium prole with aluminium hangersD stainless wire and stainless mounting materialE threaded barF plastic coated wire and stainless mounting materialG stainless proleH tensioner at blank endI reinforced aluminium proleJ Velcro

K galvanized chainL screw tensioner in the proleM Gripple hangers

Overview of Additional Accessories


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4.

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Specication

C710 /10000 A2 FBDD MEQS /PMS-2F NMM/ LGO +INC710F EQr + 2OUT(2xC500Z) +

+ 710/ R800 A Arch-90/ 4 SS+ DSC800 x600-710/ 500 F /WOUT +T Yp /IN /PL + 2DMr + AS

The specication will only describe simple Fabric Ducts or Diffusers. It is used for an approximate denition and is ngenerally detailed enough for an order. Most cases require a drawing or detailed description. The following items maappear in the specication:

1 Section C - circular, H - half-round, Q - quarter-round, SG - segment, SC - sector, S - square,T - triangular, see chap. 2.1.

2 Type of Ending F - beginning, Z - zip, H - hem, S - stitch, B - blank end, WOUT/WIN - outer/inner wingsee chap. 2.5.

3 Equaliser EQ - cone, EQS - star , EQP - pot, r - removable, see chap. 5.9.

4 MaterialPermeability: P - permeable, N - non-permeableWeight: M - medium, H - heavy, L - lightSpecication: S - standard, E - excellent re resistance, I - increased re resistance.R - increased strength, F - foil/plastic coated, see chap. 6.

5 Installation Type see chap. 3.

6 ColourWH - white, BL - blue, LB - light blue, LG - light grey, YE - yellow,DG - dark grey, GR - green, RE - red, BC - black, SP - special,GY - grey, see chap. 6.

7 Inlet Adapter C(section)710(size)F(type of ending) EQ(equalizer)

8 Outlet Adapter 2(number)C(section)500(size)Z(type of ending)

9 Arch A710(size)/R800(radius)Arch-90(angle)/4(number of segments) SS(type ofending), no letter = segment, A = adjustable arch , S = longitudinal strips

10 Reducer D(reducer)S(section)C(section)800x600(rst size)-710(second size)/500(length)F/WOUT(type of ending)

11 ReinforcingElements TY - tyre, RA - arcs, p - xture for tyres only, IN/OUT, PL/ST/AL - plastic/stainless/ aluminium, see chap. 5.8.

1

size

length

2x adjustablelength

2

Doublediffuser

membranediffuser

3

4

5

no mountingmaterial

6

officedesign

7

8

9

adjustable 10

11

2x damper

antistaticdesign


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5.5.1.

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Membrane DiffuserThis combines two types of diffuser into one. The membrane ap is a lightweight non permeable material sewn aalong the duct length. The membrane is attached to a two position motor. In heating mode the motor moves themembrane to cover the cooling diffusers located at the top of the duct, the supply air exits the heating perforationson the bottom of the duct. In cooling mode the motor moves the membrane to cover the heating perforations at thebottom of the duct and the cool supply air leaves the perforations at the top of the duct. The membrane allows twototally different diffusion styles in one duct.

heating cooling

FLAP:Used for switching between the two modes. It is made from either standard or ame retardant material,depending upon the duct specication; the internal spigot and external frame are made from galvanized steel.The length is always 400 mm. The ap includes a 220 V or 24 V servo motor.

membrane cooling microperforations

heating perforations

DIFFUSER:The membrane always covers one half of the diffuser and leaves the other open to supply air.

PLEASE NOTE:- Maximum longitudinal velocity 6.0 m/s (risk of damage to membrane at higher velocities).- Only for round cross-section ducts.

Diffuser for two different supply air modes

Design Features

h e

i g h t o

f i n s

t a l l a t i o n

D 630 mm


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5.2.

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5.3.


Negative Pressure (Extract) Ducting Fabric Ducting for removing airWe supply these only in square or triangular cross-sections. Because taught fabric is essential for extract ducting wetension the walls using a combination of suspension proles, tensioning bolts and threaded bar. Air is drawn into theduct through perforations that can be positioned on any side and anywhere along the length of the duct. To ensureequal extract rates we can adjust the perforation diameters or the gaps between the perforations progressively along

the duct. We anticipate our negative pressure ducts will be used where regular and/or thorough cleaning is required.Negative pressure fabric ducting is easily disassembled from the suspension system and unzipped into smallerwashable parts. If PMI or NMI material is used, the ducting will have both ame retardant and antibacterial propertie(impregnated silver).

Insulated Ducting

Used for decreasing temperature loss during transferof conditioned air to the diffusers. A 40mm thick,loose bre, insulating polyester material is sewnbetween two layers of fabric ducting material. Allof our fabric ducting materials are available for useas the outer layer of the insulated duct allowing aneasy match with other parts of the system. Themanufacturing process compresses the original40mm loose insulation layer by 20mm, reducing thenished product wall thickness. The maximum ductheat transfer coefficient is 1.8 W/m2/K. Insulatedduct is manufactured as standard in 2000mm zippedlengths and starts from 250mm upwards. Insulated

ducting also acts as an excellent noise dampener,absorbing and reducing in duct noise vibration,contact us for specic details.

Thermal insulation and noise dampener

Square negative pressure extract fabric ducting with tensioning frame

Sectional view of square negative pressure ducting Sectional view of triangle negative pressure ducting


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5.4.

5.5.

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Adjustable Length Fabric DuctEight adjustable tie belts are sewn along the length of the circular duct.By adjusting (tightening or loosening) all eight belts, we can manually adjustthe duct length to suit the installation requirements.IMPORTANT NOTES:- An adjustable duct with the maximum length of 1500mm can be reduced to500mm.

- The diameter of the adjustible section must be increased by 25% to maintainpermissable acceptable P.

- Only available for circular ducts with a diameter greater than 250mm.- Only from PMI, PMS, NMI, NMS, PLI, PLS, NLI, NLS materials.- Adjustable ducts cannot be manufactured with enlarged cord suspension.

Adjustable Bend

Shortening a particular belt turns the bend in that direction. The nal bend angle is achieved by adjusting the beltson certain sides of the duct to their appropriate lengths.

Placing two adjustable bends together makes it easy to avoid unmovable obstacles.

Eight adjustable tie belts (same as in adjustable length) are sewn along the length of the circular duct.

Option of changing the duct length during assembly

Bend angle may be adjusted during assembly

Length 500 Length 1000 Length 1500

Length 500 - sectional view Length 1000 - sectional view Length 1500 - sectional view

Close-up view of the tie belt

30 60 90


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Tensioners

Screw tensioners slide into the prole are used to remove wrinkles and creases in the fabric. The exibility of the fabrallows it to stretch by up to 0.5%. Pre-stretched diffusers are therefore manufactured 0.5% shorter than speciedand the true length is achieved when tensioning. The installation procedure is specied in the assembly instructionsincluded in all deliveries.

Signicantly improve appearance

Nozzles

Nozzles make it possible to deliver air at greater distances than perforations. Range can exceed 20m depending uponstatic pressure and temperature difference. Nozzles can be xed, adjustable or directed. Each of the nozzles hasa very similar visual design; the adjustable nozzle may be directed as desired up to 45 using four belts which arehidden beneath an aesthetic fabric hem. An adjustable damper is sewn into every nozzle to allow variable ows.

Fixed nozzle

For the longest airthrow5.6.

Adjustable nozzle

5.7.

IMPORTANT NOTE:We recommend using tensioners whenever possible in all aluminium prole installations.

Screw tensioner installed in the prole

End Tensioning

anchored into the wall in the axis of the diffuser anchored into the wall or ceiling

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Directed nozzle



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5.8.

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Manufactured from re resistant plastic (for diameters 400 mm), from stainless steel wire, or from at aluminiumproles. They are installed internally or externally with a standard spacing of 500 mm, the rings are fastened withVelcro and can be removed for maintenance.

Reinforcing Components

Tyres/Rings

Arcs

Used for improving uninated diffuser shapes. The ends of the Arcs are inserted into pockets sewn on to the internaducting wall, they also have a central velco fastening. Arcs can be easily removed for maintenance. Arcs are a lowecost alternative to tyres/rings.

Used to retain the shape of uninated circular ducts.

Maintaining the shape of circular ducting

Uninated diffuser with arcsInated diffuser with arcs

Inated diffuser with tyres/rings Uninated Diffuser with tyres/rings

Detailed view of internal plastic tyre fastenings Uninated diffuser with tyres/rings


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EqualisersEqualisers are used downstream of the supply fan or inlet spigot. Their function is to reduce air turbulence and ductmovement, however their use must be planned as they increase pressure drop.

Damper

Airow turbulence reduction

Equalising static pressure within a duct

5.9.

5.10.

5.11.

EQ EQS (star) EQP (pot) EQT (T-shape)perforated fabric cone star-shaped fabric sewn

into the diffusercylinder sewn from aperforated fabric withbottom

Tee shaped equaliser

The Damper is a short cone made of perforated fabric.The inlet of the damper is normal duct diameter whilstthe outlet can be adjusted to a smaller diameter, byuse of an adjustable belt. Maximum opening of thedamper outlet results in zero pressure loss, whilstfully closing the outlet provides the highest localpressure drop. The damper setting can be adjusted atany time by opening a zip on the duct circumference.By Installing a damper part way along the duct onecan equalise the static pressure within the duct andtherefore the air owing from each point along theduct. We also use dampers to provide ow controlthrough Fabric Nozzles and outlet spigots to otherparts of a system.

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Diffuser for Intensive CoolingFor cooling applications with a t 6 k we recommend using horizontal air patterns from the Fabric Duct. This cbe achieved by placing the micro-perforations in a band on either side of the duct at 90 and 270. The horizontaairow pattern must achieve a specic speed in order to prevent premature downward deection. With sufficientoutlet speed (provided by static pressure) it is possible to introduce 1 kW of cooling capacity per 1 m duct length,whilst maintaining a velocity below 0,2 m/s in the occupied zone. The air ow patterns are detailed in the illustrationbelow, please contact our authorized representatives for specic applications.

Airow patterns, microperforation 90, 165 PaMicroperforation 90

For cooling with a high temperature difference



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5.12. Air Diffuser Lantern Simple setting and directing of airowOur Lantern diffuser is designed to distribute air at high level, most often from units installed on the roof. It may onbe installed in a vertical position. The air is blown horizontally in one to six directions. Vertical sliding strips are useto regulate the ow rate.

Basic DataConnection dia D1 mm 200 315 400 500 630 710 800

Lantern dia D2 mm 400 630 800 1000 1260 1420 1600

Total length L1 mm 700 942 1170 1380 1653 1821 2060

Length L2 mm 500 684 820 980 1188 1316 1460

Airow80 Pa

50% open V m3/h 500 1240 2000 3125 4961 6301 8000

100% open V m3/h 1000 2480 4000 6250 9922 12602 16000

Weight M kg 1,0 2,1 3,2 4,9 7,5 9,3 11,7

D2

L 2

D1

L 1

Method of adjustmentclosed

Airow setting

50% open 100% open

Drawing and photo of lantern

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Defrost Damper Faster and more efficient cooler defrosting5.13.

The Defrost Damper (DeDa) collapses over the evaporator fan face, blocking off the front of the cooler, this stopunwanted fan rotation and speeds up the process of defrosting.

a) Whilst the fan runs the damper is open and supply air is owing, although the air volume is slightly reduced by thdamper. The precise reduction in volume depends upon the airow curve of the fan and the construction of thedamper.

b) When the fan stops, the damper deates and hangs down over the fan spigot. This stops fan rotation, where movingair still passes through the cooler, rotating the fan blade, which creates a faster and more efficient defrost cycle.

1) We utilise a special fabric for defrost dampers, designed to provide a good covering of the fan spigot and an inbuilresistance to ice build up (hydrophobic treament).

2) The Defrost Damper is connected to the cooler by a textile clamp or metal strip. If the defrost damper requires atransition or adapter to t to the cooler fan, these are not included but can be supplied for each specic application.

3) There is an adjustible cord with a buckle at the end of damper, which allows for adjustment of the outlet diameterDuring commissioning it is improtant to adjust the cord to balance the damper so that there is no vibration or

movement, whilst trying to minimise pressure drop.4) The Length of the Defrost Damper will always be: 1,2 x diameter + 150 mm.

Detail of adjustible cord on the outlet

Defrost damper installed on the cooler


CHARACTERISTICS:

OPERATION:


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Antistatic Design Removal of electrical energy build up5.14.

Antistatic duct design features

The earthing point

The earthing point

The highlyconductive strip

The metal joints

Moveable Inlet Adapter Positioning the inlet adapter5.15.Inlet Spigots on the at roof of a half-round or quarter-round diffuser can be specied as moveable, theseinlets can be adjusted by as much as 80mm. Themoveable inlet adapter can be helpful in cases wherethe supply air inlet into the Fabric Duct is slightly outof an agreed position . INM identies the moveableinlet adapter in the specication (the letter M isattached to the symbol of a standard adapter IN).

max. 80 mm max. 80 mm

Our Antistatic system consists of 4 measures:1. A conductive fabric (PMI and NMI conform as we add a conductive weave)2. A highly conductive strip installed all along the length of the duct

3. All zippers are equipped with metal joints4. Earthing points at the ends of the duct

The conductivefabric

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Antistatic design is intended for rooms, where a build up or uncontrolled discharge of static electricity must be avoided


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Other Products

Combined half-round section

Manometer

This is a combination of several half-round diffusers sewn together side-by-side. It enables higher air volumes witha relatively small duct height.

The static pressure in the textile diffuser can be measured using a simple manometer. Increased pressure abovea specic value due to dust collection or failed lters may serve as an indicator to wash the Fabric Duct.

We manufacture everything to order. We will gladly meet your requirements if they differ from the designor equipment specied here. Please contact us.

Winch For installing & removing Fabric Duct at one end5.16.The whole Fabric Duct can be installed from one end of the installation using a Prihoda winch. This signicantlsimplies installation and removal. This system is particularly useful where the fabric ducts are mounted overswimming pools or technical machinery where access is limited.

PLEASE NOTE:The winch system is suitable for installations 5, 5D, 5F, 5I, 5DI, 5FI exclusively.

Winch winding using approved site tools

5.17.



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Designation Permeability Weight Material SpecicationPMS/NMS yes/no medium 100% polyester 9

PMI/NMI yes/no medium 100% polyester 9PLS/NLS yes/no light 100% polyester 9

PLI/NLI yes/no light 100% polyester 9NLF no light 100% polyethylene 1

NMF no medium 100% polyester +2x PVC 4

NHE no heavy 100% bre glass+ 2x polyurethane 7NMR no medium 100% polyester 1

NLW no light 85% polyester, 15% nylon 1

a n

t i b a c t e r i a

l

r e r e s

i s t a n

t

a n

t i s

t a t i c

h i g h s

t r e n g

t h

m a c h

i n e w a s

h a

b l e

s u

i t a

b l e f o r c l e a n r o o m s

n u m

b e r o

f s t a n

d a r d c o

l o u r s

s p e c i a

l c o

l o u r s

w a

t e r r e p e

l l e n

talwaysavailable

upon request

not available

Key to the designation of fabric

f.r. = re resistance

Ffoil or PVC

Sstandard

Iincreased f. r.

Rrigid

Ehighest f. r.

Wwater repellent

L70-120 g/m2

M180-350 g/m2

H460 g/m2

Ppermeable

Nimpermeable


MaterialAs a company PHODA s.r.o. places tremendous importance on the quality of the materials used. In every case wuse specially developed materials that have been subjected to extensive development testing in order to achievemaximum performance benets for our customers. The PMI/NMI fabrics provide all the benets listed below as part

our standard design (at no additional cost).List of most important benets of our fabrics

High rigidity and strength Our basic PMS/NMS/PMI/NMI fabrics demonstrate optimum rigidity of 1800 N/10mm in the texture and 1000N/10mm in the weave. These parameters make tearing of the material in normal use almost impossible.

High re resistenceThe PMI/NMI fabrics are certied to European standard EN 13501-1 with excellent results. In this test ourfabrics achieve B-s1,d0 classication, which means prevention of spread of re, minimum smoke productionand no burning drops. NHE fabrics in fact meet class A requirements. PMI/PLI fabrics are also certied to USnorm UL 723.

Negligible bre shedding Due to the use of endless bres, ALL of our fabrics can be used in cleanrooms up to ISO Class 4. Independentlaboratory tests demonstratethat there is practically no particle shedding from our material during operation.

Antistatic effect Woven carbon bre in PMI/NMI materials removes any build up of electric charge from the surface of thefabric.

Antibacterial effectWe utilise a special treatment which guarantees that no bacteria can survive if settled on to our fabric. Thistreatment remains effective after multiple washing. Tests for the European standards found that after TENwashes there was no reduction in the efficacy of the treatment. This allows us to offer a 10 year warranty onthe basis of our minimal maintenance requirements (see the following point).

Easy to maintainOur fabrics which are manufactured using endless bres are very effective and do not allow settlement ofimpurities from the supply air. This supply air is distributed through the diffuser perforations, and the FabricDucts remain relatively clean inside (in a normal environment). They do not require any other maintenancethan outer dusting. Washing is normally only required for either hygiene or aesthetic reasons.

Stable AppearanceThanks to our endless bre technology, the appearance of the fabric does not change over time, or with multiplewashing cycles, unlike materials made of basic bres. Our PMI/NMI/PMS/NMS materials remain aesthetic aftermany maintenance cycles.


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How to Choose a Suitable Fabric?

When selecting material, please bear the following in mind

1/ Fire Resistance

Our fabrics show 3 levels of re resistance.

2/ Rigidity and Cleaning AbilityFabrics are divided into 3 categories by weight.

3/ PermeabilityPermeable material prevents condensation occuring on the duct when cooling below dew point.

4/ ColoursMost of our materials are available from stock in the range of 9 colours detailed below (shades may vary). Nonestandard (special) colours are available, but require longer delivery timescales.

Please ask for a sample book if you wish to see or match a precise colour or shade.

Peak re resistance (specied usingthe letterE, as in Excellent) meansan entirely non combustible material.Within this class, we only use fabricsconstructed from breglass witha polyurethane coating. These arehowever non permeable and morefragile than polyester fabrics ofmedium weight.

Increased re resistance (speciedusing the letter I, as in Increased)means practically non combustibleand very low smoke production. Thesematerials meet the requirements foruse in majority of spaces.

Standard polyesters or foils (speciedusing the letterS, as standard or F, asin foil) have a very low re resistance.They can be used in an environment whereno re resistance is required.

Light (marked L ). These fabrics havea mass between 70 and 120 g/m2.Diffusers made from these materialsonly require 20 Pa of static pressureto achieve good ination. However,they are light weight and have lowerrigidity and increased risk of tearingif used out of specication. All ourlightweight materials can be machinewashed with the exception of NLF.

Medium (marked M ). These fabricshave a mass between 180 and 350g/m2. They display the highestrigidity and anti-tear resistance. Theminimum static pressure requiredfor good ination is 40 Pa. All of ourmedium weight materials can bemachine washed.

Heavy (marked H ). These are PVC orpolyurethane-coated fabrics and are onlyavailable in a non permeable specication.They cannot be machine washed but canbe hosed or sprayed down. This makesour heavy materials suitable for the mostcontaminated environments. The minimumstatic pressure for good ination is 50 Pa.

R A L 9 0 1 6

P A N T O N E 1 3 5

( R A L 1 0 1 7

)

P A N T O N E 4 2 0

( R A L 7 0 3 5

)

P A N T O N E 4 2 4

( R A L 7 0 3 7

)

P A N T O N E 3 4 1

( R A L 6 0 2 4

)

P A N T O N E 1 8 7

( R A L 3 0 0 1

)

P A N T O N E 2 9 1 5

( R A L 5 0 1 2

)

P A N T O N E 7 4 6 2

( R A L 5 0 0 5

)

P A N T O N E 4 1 9

( R A L 9 0 1 7

)

WH YE LG DG GR RE LB BL BC


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Maintenance and Warranty7.All our ducting&diffusers are made from high quality and highly resistant materials without natural bre additives. Tmaterial used is specied within the technical description of your order. Diffusers/ducting made of permeable fabrics(PMS, PMI, PLS, PLI) can be washed as normal in a common/industrial washing machine. Impermeable fabrics (NNMI, NLI, NLS, NMR) may also be machine washed but only on a gentle cycle, NMF, NHE, and NLF materials mwashed by hand. If the diffuser/ducting is equipped with tyres, arcs or tensioning systems, these xed componentsneed to be taken out before washing. Outer surface dust contamination can be usually removed by using a vacuumcleaner and washing may not be necessary.

Washing Procedure:

4. Lightly drain the product, install, and dry using supplyair.

1. Wash using general washing detergents (dosage asrecommended by the manufacturer); enhance the effectby turning the duct inside out. Depending on the levelof dirt, we recommend repeating the washing cycle upto four times or use of a stronger washing detergent if

necessary.2. If hygiene procedures require it, one may adda disinfecting agent to the washing detergent. Thedisinfecting agent chemicals must not affect the fabric(see maintenance symbols), apply the detergent as permanufacturer recommendations.3. Rinse repeatedly in clean water.

Legend for symbols

8Machine wash at max. temperature of 40C, normalmechanical action, normal rinse, normal spincycle.

9Light mechanical action, rinse at falling temperature,light spin, gentle machine wash, max. temperature40C.

t Hand wash only, do not machine wash, max.temperature 40C, handle gently.

o Do not bleach product.

sProduct may be dried in rotary drum drier at reduceddrying temperature.

d Do not dry the product in a rotary drum drier.

n Iron at a max. temperature of 110C, use cautionwhen steam ironing.

m Do not iron product; steaming and steam processingis prohibited.

U Do not dry clean product, do not remove spots usingorganic solvents.

W The product is safe to dry clean usingperchlorethylene and all solvents specied underthe symbol F.

Any maintenance must strictly follow the washing label symbols sewn into every section.

washing label

The warranty period is deemed to start on the day of sale.For warranty to be valid all installation and maintenanceinstructions must be followed, in addition to good practicefor the maintenance of the supply air units. Additionally,supply air must be ltered to at least EU3 and the ductswashed or cleaned every 12 months. Chemicals used whichmay have an adverse affect on the material or ancillerieswill invalidate the warranty.

Warranty

Special conditions for printed diffusers.

1. Ambient Temperature within the range +10C to + 40C.2. Do not iron.

Warranty Period10 year fabrics PMS/NMS/PMI/NMI/NMR

2 year membrane diffuser, fabrics NMF/NLF/ NHE

2 year(max. 50washing cycles) fabrics PLS/NLS/PLI/NLI

12 monthsAll other items not mentioned above,unwoven accessories (zips, hooks, etc),printing, assembly and accessories



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Examples of Applications8.

The rst fabric diffusers wereused in the food industry. Sanitaryregulations require that all foodprocessing devices should beeasily sanitised and cleaned. Outof all the air distribution systemoptions, this condition is only metby Fabric Ducting. Fabric Ductsare perfectly clean after washingand a disinfecting agent can alsodestroy any pathogens thatmayresist the antibacterial treatment.Fabrics made of endless bres,

developed especially for Prihodastextile diffusers, are very smoothand do not allow the build up ofimpurities. This unique and specialfeature distinguishes them fromdiffusers made of staple bres thatcontinuously trap dust and canrepresent a sanitary risk.

For large retail areas we canprovide supply air through laser cutperforations or nozzles, whicheversuits the application best.Experience over many years showsthat Fabric ducting & diffusersoffers a substantially better, moreunform air pattern than can beachieved with traditional systems,whilst also offering substantial costsavings. The wide range of 9 stockcolours allows for many differentaesthetic designs whilst the FireResistance of our fabrics meet allworld wide standards.

Food processing industry

Supermarkets, exhibition and large retail areas



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Large sports facilities are a typicalapplication for Prihoda FabricDucting & Diffusers, we are able tocreate a large range of diffusion airpatterns to suit any project. Whilst

our many installations at sports andtness centres provide comfortablecooling air movement for customersworking out. In these applicationslow ceiling heights are oftenencountered, where half roundfabric ducts make an aestheticand functional low cost installationsolution. Swimming Pools are amajor user of Fabric Ducts, wherethe fabric material copes easily withthe harsh environment at a fractionof the cost of treated and insulatedrigid systems. The bright coloursavailable revive and enhance manyswimming pool interiors.

In large cold stores Prihoda FabricDucting distribution systemsprovide uniform air distribution,ensuring maintenance of stableproduct temperatures and

temperature zones. In productionzones with large amounts of peopleworking in low temperatures, highair velocity will be a major cause ofdscomfort and may cause a highersickness or absence rate. Fabricducts and diffusers disperse coldair without causing draughts, andcreate comfortable, low velocityenvironments for workers.

Prihoda Fabric Ducting airdistribution is a perfect solution forany industrial operation. PrihodaFabric Ducts provide uniform lowvelocity air distribution or targetedair patterns, at unbeatably low costs.Over 100 suspension solutionsmake it possible to choose aconvenient installation style for anyapplication, easily accommodatingmost suspended and formed ceilingtypes. Contaminated productionenvironments may require the

use of fabrics with larger laser cutperforations.

Food Stores, Low Temperature Production Areas

Chemical, Textile and Electronics Industries

Pools, Sports Halls and Fitness Centres



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Space in kitchens is usually minimal, and their extreme load with heat andvapours requires intense ventilation. Prihoda Fabric Ducts disperse highvolumes of air uniformly into this environment without creating draughts.The fabric material used is resistant to steams and vapours and maintenanceis very quick and easy. Compared to a traditional stainless steel installationFabric Ducting is a much lower purchase, installation and maintenance costand easily achieves sanitary and hygiene demands due to its cleanability.

Higher aesthetic demands can besatised by the muliple colour andshapes available withPrihoda FabricDucting air distribution. Correctlymanufactured and perfectlyinstalled fabric diffusers becomean elegant part of an interior. Airdiffusion through Fabric Ductingprovides similar results to chilledbeams or perforated ceilings,however although the performanceis similar, Fabric Ducting is availableat a much lower capital cost. Unlikethe traditional diffusers, embeddedin soffits, our broadly diffusedsolutions do not cause any localheat discomfort. Experience has

demonstrated that employees insuch equally distributed and cooledoffices are signicantly morecomfortable.

The benets of using Prihoda Fabric Ducting and distribution systems forcooling or heating of large scale tents or other temporary structures are

self evident. Light weight roof structures can easily support fabric ductingand diffusers weighing from 100 to 400 g/m. Installation is very quick,using the supporting wires and hooks provided as part of the system. Topquality materials allow multiple repeated use. Cooling or heating using alarge AHU and Fabric Ducting diffusing all along the structure,is much moreeconomical than simply blowing the air into a space. Specically with heatingthe warm air rises quickly creating a high temperature zone high in theceiling and enourmous heat loss. In cooling, with air diffused through FabricDucting intense airow causes local air current sand draughts; whilst elsewhere zones with insufficient cooling develop. Both cases are successfullyresolved by a properly designed Fabric Ducting distribution system.

Kitchens

Offices, Restaurants, Cinemas etc.

Temporary Installations



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9.


Frequently Asked Questions

PHODA s.r.o. were the rst manufacturer worldwide to introduce negative pressure ducting onto the market. It made with a square or triangular shape. The principal is based on sufficient stretching of all ducting walls by mean

of a tensioning system. The construction enables simple disassembly and re-installation. Laser cut perforations areused to allow the air into the duct.

This is not a short term solution. Diffusers made from good quality fabrics will last for fteen years or longer. Ligfabrics (approx. 100 g/m2) with maximum permitted number of 50 washing procedure or the cheap, (usuallypolyethylene foils susceptible to tearing) may have limited durability.

In a well designed straight diffuser there is an almost constant static pressure throughout. The fabric perforation iscalculated based on the average value of the static pressure. In other words, the diffuser is designed based on theexternal static pressure of the system. Shaped pieces (bends) and turbulence equalisers present certain pressureloss which needs to be taken into consideration. Loss caused by friction is usually minimal due to the decreasing airspeed inside the diffuser. The minimum utilisable pressure is 50 Pa, however light material will inate from 20Pa.

Diffusers with micro-perforation and even diffusers with larger laser cut holes never get completely clogged bcontamination (if used with minimum pre-ltration EU3). The maintenance (typically washing in a washing machinis really only necessary for hygienic and aesthetic reasons. Each individual zipped section contains a washing labelwhich provides all washing information. Our experience has proven that our fabrics made of endless bres remai(practically) internally clean after many years of operation.

1/ What does a Fabric Duct look like when the fan is switched off?

single suspension double suspensionsingle suspension

with arcssingle suspension

with tyres

inated without air supply

Circular diffuser - comparison of installation

more in chap. 5.8.

2/ Is it possible to use Fabric Ducting for extract (exhaust air)? more in chap. 1.3. , 5.2.

3/ What is the service-life duration of Prihoda Fabric Ducts?

4/ What is the pressure loss of a Fabric Duct? more in chap. 2.3.

5/ What do you do with diffusers when they get clogged by dust or other contamination?more in chap. 7.


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Mould can form on any kind of material if it is moist and unventilated. This goes for fabrics with antibacterial treatmetoo. It is caused by the fact that moulds are not bacteria. Therefore, never store moist diffusers and do not keep themout of operation for long periods of time. Moulds cannot be removed from fabrics once established.

PHODA s.r.o. has developed a special construction which enables use of a quadrangular cross-section. The principis based on stretching the fabric in transverse and longitudinal direction by means of a tensioning system. Theconstruction enables simple disassembly and re-installation. Fabric ducting with quadrangular cross-section can beassembled directly on the ceiling or suspended in the area.

If permeable materials are used, the fabric functions as a lter for the part of the transferred air that goes through thefabric. As the fabric contamination gradually increases, the pressure loss grows and the air ow decreases. Therefore,it is necessary to wash the fabric. We consider the utilisation of microperforated or laser cut perforated fabric to beby far the best solution. Although perforated fabrics do not function as lters they do not change the pressure lossvalue and the number of necessary washing procedures signicantly drops. We are a manufacturer of distribution(not ltering) ducts and diffusers.

Use of plastic nozzles or longitudinal slots can be explained on historical basis. These tools used to enable certainair distribution patterns, the nozzles in addition protected the frayed edges of the holes. When we began to use lasertechnology that allows cutting of accurate holes with sealed margins, they became redundent. Correctly designedrows of laser cut holes full the same purpose, whilst being cheaper and more aesthetic. This is the reason whyPrihoda s.r.o. chooses not to use either slots or plastic nozzles and yet achieves the same air distribution.

We use permeable materials to avoid condensation where supply air temperature is below dew point. However, weonly have material of a single permeability value. It is very low and serves just to prevent condensation. For air

distribution we use laser cut holes exclusively (perforation or microperforation or a combination of both). Our producportfolio also includes non permeable materials, which are often useful in other situations.

6/ Can Fabric Ducts get mouldy?

7/ Is it possible to use square or rectangular diffusers? more in chap. 2.1., 5.2.

8/ Does the Fabric Duct function as a lter at the same time?

9/ Why doesnt PRIHODA use plastic nozzles or slots?

10/ Why doesnt PRIHODA use more permeable fabrics?

microperforation perforation


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5+5+510.


5/ AestheticsVarious colour and shape combinations exist to satisfy most aesthetic demands, theproduct can blend into, or become a tasteful part of the buildings interior.

5/ Antistatic Design

Our material includes interwoven carbon bres which make our Prihoda PMI, NMI andNMR textiles more electrically conductive. The voltage between the Fabric Ducts and thebuilding structure is zero when properly earthed/grounded.

5 for Fabric Ducting&Diffusers

5 for PRIHODA`s Fabrics

1/ Economy & SpeedThe cost saving when using Prihoda Fabric Duct against traditional sheet steel rigid ductcan be as much as 70% especially when you take into account the cost of conventionaldiffusers, cost of transport, and much longer installation times and commissioning.Installation and/or removal take a fraction of the time needed for conventional systems.2/ Hygiene Cleaning is simple, the ducts are easy to remove and cleaned in conventional washingmachines, once cleaned and disinfected Fabric Ducts are 100% clean, much more than canbe guaranteed with traditional rigid systems.

3/ Ecology Prihoda Fabric Ducts & Diffusers are environmentally-friendly, requiring much less energythan manufacturing, transporting and installing heavy traditional rigid systems. PrihodaFabric Ducts are also partially manufactured of recycled material, we can, upon request

arrange to collect old or unused components.4/ Technique Design and positioning of distribution inlets and spigots is optimal,as is their size. Aninexhaustible number of air distribution methods can be achieved from draught free rightthrough to high velocity targeted air patterns with a long throw.

1/ Optimum Strength Through our own long-term development, we have optimised the mass of our textiles tocirca 200 to 220 g. The textile strength moderately exceeds the seam strength, which isideal. Greater strength or heavier materials do not in any way benet customers as thestrength of a product is limited by the strength of the seams.

2/ Negligible Outlet of ParticlesBecause we use endless bres, all of our fabrics can be used in Clean Rooms up to ISO Class4. Independent laboratory tests have demonstrated almost zero particle emmissions fromPrihoda materials in operation. Prihoda fabrics are very smooth and do not allow settlementof impurities from owing air. This air is distributed through the laser cut holes, and thetextile diffusers remain practically clean inside (in a normal environment). Prihoda Fabricsdo not require any other maintenance than outer dusting. Thanks to endless bres, theappearance of the fabric will not change even after multiple washing cycles, unlike materialsmade from staple bres.

3/ Antibacterial Effect Our special antibacterial treatment guarantees elimination of all bacteria in direct contactwith the material. This treatment is unaffected by multiple washing. After ten washingcycles the Prihoda antibacterial material still conforms to the requirements of the relevantinternational standard, which means realistically a lifetime guarantee considering the lowfrequency of washing required with our fabrics. This applies to PMI/NMI/NMR fabrics.

4/ High Fire Resistance Our Prihoda PMI/NMI/NMR fabrics are certied in accordance with EN 13501-1 withexcellent results. Prihoda material achieve classication B-s1,d0. (excellent re resistingperformance B, low smoke emmissions S1, zero moulten, aming drips d0) This farexceeds the requirements of UL 723 norms in the U.S. Our range of products also includesclass A2 - textiles made from bre glass.


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5/ SpeedDespite manufacturing mostly bespoke items, we are still able to meet verydemanding delivery timescales, thanks to our excellent work organisation. In2012, we delivered roughly 4500 orders into 56 countries across the globe.More than 99% of these deliveries were dispatched within our conrmeddelivery timescales. The delivery time in order-based production did notexceed 3 weeks throughout the year; a range of orders was produced withinan express delivery time of 1 week.

5 for PRIHODA

1/ Best Price/Quality RatioWe offer the best ratio between price and quality. Our very reasonable pricesdo not mean any compromise on quality. We hold ourselves responsible forthe products we deliver, their proper operation and long service life are a

priority for us.2/ Experience, Knowledge & Technical Support This is the only product we manufacture and we focus constantly in itsimprovement. Our engineers verify carefully every technical detail in ourspecialised test room. Every order placed has had engineers check itstechnical parameters prior to manufacture and delivery.

3/ Innovations Every year we launch several new ideas on to the market as a naturalconsequence of the enthusiasm and creativity of our teams. We do notconsider anything nished, everything can be improved. For examplemicroperforation of fabrics, is our unique technology.

4/ Long Warranty Period Because of the highest quality materials and manufacturing techniques, weare able to provide a ten-year warranty.

PHODA s.r.o.Za Radnic 476539 01 Hlinsko

EU - Czechiatel.: +420 469 311 856fax: +450 469 311 857

[email protected]

technical data prihoda

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