performing commercial mechanical plan reviews · performing commercial mechanical plan reviews ......

Performing Commercial Mechanical

Plan ReviewsBased on the 2012 Michigan Mechanical Code

and the 2012 International Fuel Gas Code

`

Welcome

▪ I am…

▪ You are…

▪ What do you do?

▪ Where are you from?

▪ How familiar are you with the IMC and/or IFGC?

▪ What do you hope to get out of this seminar?

2Copyright 2009, International Code Council

Overview

▪ General Mechanical Code Plan Reviews

▪ Performing Appliance Reviews

▪ Reviewing Fireplaces and Solid Fuel Appliances

▪ Performing Plan Reviews of Piping Systems


Overview

▪ Performing Ventilation Plan Reviews

▪ Reviewing Inspections of Combustion Air Provisions

(Gas) and NonGas

▪ Performing Venting Systems Plan Reviews

▪ Performing Plan Reviews of Exhaust Systems


Overview

▪ Reviewing Ducts and Plenums

▪ Performing Refrigeration Plan Reviews

▪ Plan Review of Gas Piping Installations


GENERAL MECHANICAL

INSPECTION

Module 2

Performing Required General

Inspections

1. Check underground installations.

IMC section 107.2 (1)/IFGC Section 107.2 (1)

2. Check rough-in components.


3. Perform the final inspection.


4. Review evaluations and inspection reports.

IMC section 107.2.5/IFGC Section 107.2.5

7Copyright 2009, International Code CouncilWorkbook Page 9-10

Observing/Verifying Tests

1. Check for Apparatus, Material and labor for Tests.

IMC Section 107.3.2/IFGC Section 107.3.2

2. Verify and/or observe tests.

IMC Section 107.3/IFGC Section 107.3

3. Retest failures.



Performing Clearance to Combustibles

Inspections

Two tasks:

1. Inspect clearances (only one step).


2. Inspect clearance reduction methods.

IMC Table 308.6/IFGC Table 308.2

9Copyright 2009, International Code CouncilWorkbook Page 13

How To Measure

▪ IMC Table 308.6/IFGC Table 308.210Copyright 2009, International Code Council

Workbook Page 14

Task 1: Inspect Clearances

▪ While performing an inspection you find a finished

wood door that opens to within an inch of an

appliance that requires a minimum clearance of

12 inches (305 mm). An installer tries to convince

you that a fire hazard is not present since the door

is mechanically closed automatically.

▪ As a code official, what would you do?

▪ How would you explain your position to the contractor?


Task 2: Inspect Clearance Reduction

1. Check that reduction is allowed.

IMC Section 308.2

2. Check listed appliances and equipment.

3. Check protective assembly construction and installation.

IMC Section 308.3

4. Check allowable reduction.


Reduced Clearance for 3 ½ -inch Brick

Wall


For SI: 1 inch = 25.4 mm

Workbook Page 15-16

Reduced Clearance to Combustibles Using

Protective Assemblies


Performing Protection of Structure

Inspections

Four tasks:

1. Inspect structural safety.

IMC Section 302.1/IFGC Section302.1

2. Inspect cutting, notching and boring in wood framing.

3. IMC Section 302.3/IFGC Section 302.3

4. Inspect alterations to trusses.


5. Inspect cutting, notching and boring in steel framing. IMC

Section 302.5/IFGC Section 302.5


Workbook Page 17

Task 1: Inspect Structural Safety

1. Check for structure weakening.


2. Check structural condition after structural alterations.


3. Check protection of penetrations of floor/ceiling assemblies

and fire-resistance-rated assemblies.



Task 2: Inspect Cutting, Notching and

Boring in Wood Framing

1. Check joist notching.


2. Check stud cutting and notching.


3. Check bored holes.


4. Check engineered wood products.



Limitations for Cutting, Notching and

Bored Holes


Bored Hole Limitations


19Copyright 2009, International Code CouncilWorkbook -20

Task 3: Inspect Alterations to Trusses

1. Check truss condition.

IMC Section302.4/IFGC Section 302.4

2. Check for alterations that add to loads of trusses.

IMC Section302.4/IFGC Section 302.4


Task 4: Inspect Cutting, Notching and

Boring in Steel Framing

1. Check cutting, notching and boring holes in structural steel

framing.

IMC Section 302.5.1/IFGC Section 302.5

2. Check cutting, notching and boring holes in cold-formed steel

framing.


3. Check cutting, notching and boring holes in nonstructural cold-

formed steel wall framing.



PERFORMING APPLIANCE

INSPECTIONS

Module 3

Performing Appliance Location

Inspections

Three tasks:

1. Inspect general locations.


2. Inspect indoor locations.


3. Inspect outdoor locations.



Task 1: Inspect General Locations

1. Check for hazardous locations.

IMC Section 303.2 and 304.3/ IFGC Section 303.2 and

305.2

2. Check for prohibited locations.

IMC Section 303.3/ IFGC Section 303.3

3. Check for protection from damage.

IMC Section 303.4/ IFGC Section 303.4


Task 2: Inspect Indoor Locations

1. Check room volume.


2. Check fuel-fired furnaces and boilers installed in closets

and alcoves.


3. Check elevator shafts.



Task 3: Inspect Outdoor Locations

1. Check for outdoor listings and labels.



Performing Appliance Access

Inspections

Five tasks:

1. Inspect appliances in rooms.


2. Inspect appliances in attics.


3. Inspect appliances under floors.


4. Inspect equipment and appliances on roofs and elevated

structures.


5. Inspect appliances on sloped roofs.



Task 1: Inspect Appliances in Rooms

1. Check for compliance with access requirements.


2. Check central furnaces installed in compartments or

alcoves. IMC Section 306.1.1


Task 2: Inspect Appliances in Attics



2. Check for compliance with electrical requirements.



Attic Location Requirements

30Copyright 2009, International Code CouncilWorkbook

Task 3: Inspect Appliances Under

Floors



2. Check for compliance with electrical requirements.



Task 4: Inspect Equipment and Appliances on Roofs

and Elevated Structures

1. Check for permanent approved means of access.


2. Check for obstacles to access and access safety.


3. Check permanent ladders.


4. Check catwalks.



Task 5: Inspect Sloped Roofs

1. Check for level platforms.


2. Check platform dimensions.


3. Check for guards on platform.



Access Platform On Roof


Performing Appliance Installation

Inspections

Eight tasks:

1. Examine installation information.


2. Resolve conflicts (if applicable).


3. Inspect installations having ignition sources.


4. Inspect ventilation for hydrogen generating and refueling

operations.

IMC Section 304.5.1 through 304.5.3/IFGC Section 703.1.1

through 703.1.3305.1


Performing Appliance Installation

Inspections

Eight tasks (cont.):

5. Inspect garages. IMC Section 304.6 and 304.7/IFGC Section 305.19 and 305.10

6. Inspect for boiler and furnace rooms. IMC Section 305.5

7. Inspect for Guards IMC Section 304.11/IFGC Section 306.6

8. Verify clearance from grade.IMC Section 304.10/IFGC Section 305.7


Task 1: Examine Installation

Information

1. Check the manufacturer’s installation instructions.


2. Check the applicable IMC/IFGC code sections.


3. Compare the two.


Task 2: Resolve Conflicts

1. Identify if installation information contains conflicts.


2. Resolve the conflict.



Task 3: Inspect Installations Having

Ignition Sources

1. Check if the ignition source is located in a hazardous

location or other listed locations.


2. Check the elevation of ignition source.



Oil-fired Water Heater Installation in a

Hazardous Area



Task 4: Inspect Ventilation for Hydrogen Generating

and Refueling Operations

1. Check for compliance with code requirements.

IMC Section 304.4/IFGC 703.1

2. Check natural ventilation

IMC Section 304.5/IFGC 703.1.1

3. Check mechanical ventilation

IMC Section 304.5.2/IFGC 703.1.2

4. Check specially engineered installations (if applicable). IMC

Section 304.5.3/IFGC 703.1.3


Task 5: Inspect Garages

1. Check public garages.


2. Check private garages.



Appliance Installation in a Public

Garage

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm.


1

Workbook Page 41

Task 6: Inspect Boiler and Furnace

Rooms

Verify that boiler and furnace rooms are protected as

required by the International Building Code.

IMC Section 304.8/IFGC Section .305.6


Task 7: Inspect for Guards

1. Check that guards are present where required.

IMC Section 304.11

2. Check guard extensions.

IMC Section 304.11

3. Check the top of the guard(s).

IMC Section 304.11

4. Check guard construction.

IMC Section 304.11


Guards


Guards – Plan View

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm


Task 8: Verify Clearance from Grade

1. Check for appliance supports



PERFORMING INSPECTIONS

OF FIREPLACES AND SOLID

FUEL APPLIANCES

Module 4

Three Tasks

1. Inspect masonry fireplaces.

IMC Section 902

2. Inspect factory-built fireplaces.

IMC Section 903

3. Inspect fireplace stoves and room heaters, pellet fuel

appliances, and barbecue appliances.

IMC Section 904 through 906


Task 1: Inspect Masonry Fireplaces

▪ One step: Check that masonry fireplaces are built according

to the IBC.

IMC Section 902.1


Task 2: Inspect Factory Built Fireplaces

1. Check fireplace and chimney installation.

IMC Section 905.2 and IFGC Section 903.1

2. Check hearth extensions.

IMC Section 903.2

3. Check appliance installed in fireplaces.

IMC Section 903.3 and UL 127


Typical Factory-build Fireplace With

Hearth


Workbook Page 47

Task 3: Inspect Fireplace Stoves and Room

Heaters, Pellet Fuel Appliances and Barbecue

appliances

1. Check installation.

IMC Section 905/IFGC

Section 602

2. Check for pellet fuel burning

appliances vent connection.

IMC Section 904

3. Check barbecue appliances

for compliance with IMC and

IFGC.

IMC Section 906 and IFGC

Section 623



OF PIPING SYSTEMS

Module 5

Four Parts

1. Performing inspections of hydronic piping

IMC Chapter 12

2. Performing inspections of refrigerant piping

IMC Chapter 11

3. Performing inspections of condensate piping

IMC Section 307/IFGC Section 307

4. Performing inspections of fuel piping and storage

systems

IMC Chapter 13


Performing Inspections of Hydronic

Piping

Three tasks:

1. Inspect piping materials.

IMC Section 1202

2. Inspect piping installation.

IMC Section 1206

3. Inspect transfer fluid.

IMC Section 1207


Performing Inspections of Refrigerant

Piping

Three tasks:


IMC Section 1107

2. Inspect joints.


3. Inspect stop valves.

IMC Section 1107.8


Performing Inspections of Condensate

Piping

Three tasks:

1. Inspect fuel-burning appliances.


2. Inspect drain pipe materials and sizes.

IMC Section 307.2.2 and Table 607.2.2/IFGC Section 307.3

3. Inspect evaporators and cooling coils.



Task 1: Inspect Fuel Burning

Appliance Drain

1. Check collection and discharge.

IMC Section 307.1/IFGC Section 307.2.

2. Check horizontal slope.


3. Check for corrosion resistance.


4. Check drain size. IMC Section 307.2.2 and Table 37.2.2/IFGC Section 307.3.


Task 2: Inspect Drain Pipe Materials

and Sizes

1. Check component materials.

IMC Section 307.2.2/IFGC Section 307.3.

2. Check material selection.


3. Check condensate waste and drain line size.

IMC Section 307.2.2and Table 307.2.2/IFGC Section .


Task 3: Inspect Evaporators and

Cooling Coils

1. Check condensate disposal point.

IMC Section 307.2.1

2. Check auxiliary and secondary drain systems.


3. Check traps.



Performing Inspections of Fuel Piping

and Storage Systems

Two tasks:

1. Inspect fuel oil piping.

IMC Table 305.4 and 1302.3.

3. Inspect hydrogen piping.

IMC Table 305.4 and IFGC Section 704, 705.


Task 1: Inspect Fuel Oil Piping

1. Check for IFC

compliance.

IMC Section 1301.1.

2. Check materials.

IMC Section 1302.

3. Check joints and

connections.

IMC Section 1301.

4. Check fuel oil system

installation.

IMC Section 1305.

5. Check fill piping.

IMC Section 1305.6.

6. Check vent piping.

IMC Section 1305.7 .


Task 3: Inspect Hydrogen Piping

1. Check piping. IMC Section 704

2. Check use. IMC Section 704.2

3. Verify tests.IMC Section 705

4. Check location. IFGC Section 706

5. Check for IFC compliance. IFGC Section 704.3


PERFORMING VENTILATION

INSPECTIONS

Module 6

Four Tasks

1. Inspect exit enclosure ventilation.

IMC Section 601.3

2. Inspect openings.

IMC Section 401.4

3. Inspect natural ventilation.

IMC Section 402

4. Inspect mechanical ventilation.

IMC Section 403


Task 1: Inspect Exit Enclosure

Ventilation

1. Check intake openings.

IMC Section 401.4

2. Check exhaust openings.

IMC Section 501.2.1.

3. Check opening protection.

IMC Section 401.5.

4. Check contaminant sources.

IMC Section 401.6.


Air Intake Opening Locations



Workbook Page 79-80

Task 2: Inspect Openings

▪ One step – Check Intake opening.

IMC Section 401.4 and 501.2.1


Task 3: Inspect Natural Ventilation

1. Check for natural ventilation openings. IMC Section 402.1.

2. Check ventilation area required. IMC Section 402.2.

3. Check adjoining spaces. IMC Section 402.3.

4. Check openings below grade (if present).IMC Section 402.4.


Task 4: Inspect Mechanical Ventilation

1. Check the ventilation means. IMC Section 403.1.

2. Determine the ventilation rate. IMC Table 403.3.

3. Check the ventilation rate. IMC Table 403.3.

4. Check the recirculation of air. IMC Section 403.2.1.

5. Check transfer air, if being utilized. IMC Section 403.2.2.

6. Check common ventilation systems.IMC Section 403.2.3


An Energy-conserving Alternative to

Natural Ventilation


PERFORMING INSPECTIONS OF

COMBUSTION AIR PROVISIONS

(GAS) AND NONGAS

Module 7

74

Five Parts

1. Performing inspections of indoor air (gas).

IFGC Section 304.5.

2. Performing inspections of outdoor air provisions.

IFGC Section 304.6.

3. Performing inspection of combination indoor/outdoor air.

IFGC Section 304.7.

4. Performing inspections of engineered systems and

mechanical combustion air supply.

IFGC Section 304.8.


Five Parts (cont.)

5. Performing inspection of nongas fuel installation.

Mechanical Combustion Air Supply.

IFGC Section 304.9

76Copyright 2009, International Code CouncilWorkbook Page

91

Performing Inspections of Indoor Air

(Gas)

1. Determine the required indoor volume.

IFGC Section 304.5.1 and 304.5.2

2. Check indoor opening size and location.

IFGC Section 304.5.3.


All Air from Inside the Building


Performing Inspections for Outdoor

Air (Gas) Provisions

Three tasks:

1. Inspect air opening dimensions.

IFGC Section 304.6.

2. Inspect two-permanent-opening method.


3. Inspect one-permanent-opening method.



Task 1: Inspect Air Opening

Dimensions

One step - Check minimum dimension of any air

opening.

IFGC Section3 04.5.3, 304.5.3.1 and 304.5.3.2.


Task 2: Inspect Two-Permanent-

Opening Method

1. Check opening location.

IFGC Section304.5.3.

2. Check communication to the outdoors.

IFGC Section 304.6


Inlet Air from Ventilated Crawl Space and

Outlet Air to Ventilated Attic


Inlet Air from Inlet Duct and Outlet Air

to Ventilated Attic



Workbook Page 96

All Air from Outdoors


Task 3: Inspect One-Permanent-

Opening Method

1. Check opening location.


2. Check communication to the outdoors.


3. Check clearances.



One-Permanent-Opening Method, All

Air from the Outdoors


Performing Inspections of Combination

Indoor/Outdoor Air

Three tasks:

1. Inspect indoor openings.


2. Inspect outdoor opening location.


3. Inspect outdoor opening(s) size.



Task 1: Inspect Indoor Openings

1. Check for the minimum free area.


2. Check opening locations.



Task 2: Inspect Outdoor Opening

Location

One step – Check opening locations.

IFGC Section 304.7.3 and 304.10


Task 3: Inspect Outdoor Opening(s)

Size

One step – Check outdoor opening sizes.

IFGC Section 304.6,304.6.1 and 304.6.2.


Performing Inspections of Engineered Systems

and Mechanical Combustion Air Supply

Two tasks:

1. Inspect engineered systems.

IFGC Section 304.8.

2. Inspect mechanical combustion air supply.

IFGC Section 304.9.


Task 1: Inspect Engineered Systems

One step – Verify that engineered systems meet the

intent of the code.

IFGC Section 304.8.


Task 2: Inspect Mechanical

Combustion Air Supply

1. Check outdoor air supply rate.

IFGC section 304.9

2. Check makeup air.

IFGVC Section 304.9.1.

3. Check appliance interlock.


4. Check combined combustion air and ventilation air system.



Mechanical Combustion Air Supply

System


Mechanical Combustion Makeup Air

Supply System


PERFORMING VENTING

SYSTEMS INSPECTIONS

Module 8

Five Tasks

1. Inspect for general compliance.

IFGC Section 501.1 and 501.2.

2. Inspect vents.

IFGC Section 502 and 503.1.

3. Inspect chimneys.

IFGC Section 501.3.

4. Inspect connectors.

IFGC Section 503.10 and 504.3.2.

5. Inspect appliance venting.

IFGC Section 503.


Task 1: Inspect for General Requirements

Compliance

▪ Only 1 step

IFGC Section 501.2 and 503.

▪ The critical operating characteristics are as follows:

▪ Positive or nonpositive (negative or neutral) pressure

within the venting system.

▪ Whether the flue gas generated has a temperature

that approaches the dew point making excessive

condensation likely.


Appliance Categories

Pressure Excessive Condensation

Positive Non-Positive Avoids Creates

Category I X X

Category

II

X X

Category

III

X X

Category

IV

X vented X

Copyright 2009, International Code Council

Workbook Page 105100

Task 2: Inspect Vents

1. Only one step

IFGC Section 502.1, 503 and 504.

▪ There are six types of venting systems that must be

inspected:

1. Type B gas vent.

2. Type BW gas vent.

3. Type L vent.

4. Chimney.

5. Single-wall metal pipe.

6. Plastic pipe and stainless steel special venting systems.


Task 3: Inspect Chimneys

1. Check masonry

chimneys.

IFGC Section 501.3

2. Check for common

chimneys or flue-ways.

IFGC Section 501.9.

3. Check gas-fired

appliances.


4. Check for decorative

shrouds.

IFGC Section 503.6.4.1.

5. Check existing chimneys

and vents.

IFGC Section 501.15.

6. Check sizing of venting

systems.

IFGC Section 501.15.1


Decorative Shrouds


Existing Chimneys and Vents

OUTSIDE WALL

REPLACEMENT BOILER-CATEGORY III VENTEDTHROUGH WALL

REMOVED APPLIANCE,PREVIOUS CHIMNEY-CONNECTED BOILER

EXISTING MASONRY CHIMNEY

EXISTING WATER HEATER

CLEAN-OUT


Vent System Performance Factors


Task 4: Inspect Connectors

1. Check for potential condensate production.

IFGC Section 503.1 and 503.9.

2. Check connector location.

IFGC Section 503.10 through 503.15.

3. Check combined connectors.

IFGC Section 503.10.3.3.

4. Check offsets.

IFGC Section 503.10.9, 504.2.3 and 504.3.2.

5. Check connector length limit.

IFGC Section 504.3.2 and 503.10.9.


Connectors


Vent System

Which vent system is designed more efficiently?


A = 20 percent capacity reduction

Water Heater

40MBH

NAT

40MBH

NAT

80MBH

FAN

80MBH

FAN

Water HeaterFurnace Furnace

HEIGHT20´

3”

4”

5” 5”OFFSET

LENGTH

SYSTEM A

B = 10 percent capacity reduction

LENGTH

MANIFOLD

ELBOWOR

TEE

SYSTEM B

HEIGHT

Note: = Connectors

20´

1 MBH = 1000 Btu/h


Workbook Page 113-115

Vent System: Answers

▪ Determine the correct maximum connector length

▪ Compare to the actual length

IFGC TABLE 504.3.2 with no reduction

IFGC Sections 504.3.4 and 504.3.5 you must take

reductions so there are not as efficiently


Connector Length Limit


A 3" diameter

B 4" diameter

C 6" diameter

2.5'

4.5'

2'

1'

9.5'

FANOR

DRAFTHOOD

APPLIANCEDRAFTHOODDRAFTHOOD

DRAFTHOOD


Workbook Page 116

Connector Length Limit - Answer

▪ A: Actual connector length = 2.5

Max. allowed = 4.5▪ B: Actual connector length = 4.5

Max. allowed = 6.0▪ C:Actual connector length = 9.5

Max. allowed = 9.0


Task 4: Inspect Connectors

6. Check for length alternative.

IFGC Section 503.10.9 or 504.3.2.

7. Check for common vent offsets.

IFGC Section 503.6.9.2 or 504.3.5.

8. Check for vent capacity reduction.


9. Check for connector capacity reduction.


10. Check seven times rule.



Step 6 Check for length altenative

▪ If a furnace is served by a 5-inch (127 mm) vent

connector that is 12 feet (3658 mm) in length,

the 11/2 feet (457 mm) for every inch of

connector diameter is exceeded by 41/2 feet

(1402 mm). Therefore, the maximum capacity of

the connector would be reduced by 10 percent.


Length Alternative


3' R

ISE

5-INCH DIAMETERDOUBLE-WALL CONNECTOR

CL

DOUBLE-WALLCONNECTOR

FROM 2ndCATEGORY IAPPLIANCE

HOT WATER BOILERFAN-ASSISTED82% EFFICIENT135,000 Btu/h

20 ftTOTALVENT

HEIGHT

Workbook Page 118

Length Connector

A. Determine maximum allowable vent

connector length

▪ Use Table 504.3.2

▪ 5 inch (127 mm) connector diameter is 7 ½

feet (2286 mm).

225


Length Connector

B. Determine absolute maximum allowable

vent connector length

▪ Use Section 503.10.9

▪ 5 inch (127 mm) connector diameter 20 feet

(6096 mm).

195


Length Connector

C. Evaluate steps 1 and 2

▪ Apply the more restrictive criteria, or

▪ Apply connector length alternative provisions

of Section 504.3.3

30


Length Connector

D. Apply provisions of Section 504.3.3

▪ Use Tables 504.3(2) and 504.3(1)

▪ Extend vent connector maximum length to 15 feet (4572 mm)

▪ Apply 10 percent capacity reduction

▪ Maximum input capacity of 176,000 Btu/h (51 535 W)

▪ [176,000 x .90] = 158,400 Btu/h (46 381 W)

▪ 158,400 Btu > 135,000 Btu/h (46 381 W > 39 529 W)

▪ Boiler exceeds minimum required input of 59,000 Btu/h

(17 276 W) in Table 504.2(1)


(A/B × C) + D

(2.5/5 × 30) + 195 =

1/2 × 30) + 195 =

15 + 195 = 210

Workbook Page 119

Offsets


Step 10 - Seven Times Rule

Flow area of vertical vent must not be larger

than seven times the area of the smallest

appliance vent connection.


Task 5: Inspect Appliance Venting

1. Check sizing of category I appliance venting systems.


2. Check sizing of venting systems for a single appliance.


3. Check minimum size.

IFGC Section 504.2.2 (1-5).

4. Check vent offsets.

IFGC 504.2.3.



5. Check multiple input rate appliances.

IFGC 504.2.6.

6. Check chimney and vent locations.

IFGC 504.2.9.

7. Check liner system sizing.

IFGC 504.2.7.

8. Check vent area and diameter.




9. Check table interpolation.

IFGC Table 504.3 (1) and 504.3 (2).

10. Check sizing of a venting system for two of more

appliances.

IFGC Table 504.3 (1) through 504.3 (7).

11. Check height and rise measurement.

IFGC Table 504.3 (1) through 504.3 (7).

12. Check vent fittings.

IFGC Section 504.3.17.123Copyright 2009, International Code Council


Table Interpolation

IFGC Table 504.2(1)

▪ Vent type is Type B from

furnace connection to

terminal

▪ Input rating of draft hood

furnace = 210,000 Btu/h (61

545 W)

▪ Vertical design height of

vent = 121/2 feet (3810 mm)

▪ Diameter of vent = 6 inches

(152 mm)

▪ Length of lateral = 2 feet

(610 mm)


Table Interpolation

IFGC Table 504.2(1)

A. Find the maximum vent capacity (MAX) at the

first height entry greater than 121/2 feet (3810

mm), [i.e., 15 feet (4572 mm)].

225

B. Find the maximum vent capacity (MAX) at the

next height entry lower than 121/2 feet (3810

mm), [i.e., 10 feet (3048 mm)].

195


Table Interpolation

IFGC Table 504.2(1)

C. Determine the difference between the two maximum vent

capacities.

330

D. Determine the maximum vent capacity for a 121/2-foot-

high (3810 mm) vent.


(A/B × C) + D

(2.5/5 × 30) + 195

(1/2 × 30) + 195

15 + 195 = 210

Workbook Page 128

Sizing Type B Vent System



A. Find each connector size:

a. Select correct table:

Table number: ____________________

b. Determine the least total height of vent and the rise for

each connector.

Vent height: ____________________

Water heater rise: ____________________

Furnace rise: ____________________

c. Determine the vent connector size per the applicable

table:

Water heater: ____________________

Furnace: ____________________128Copyright 2009, International Code Council

504.3(1)

15 feet (4572 mm)

1 foot (305 mm)

3 feet (914 mm)

4 inch (102 mm)

5 inch (127 mm)

Workbook Page 133


B. Find common vent size:

a. Determine the total Btu/h input:

Combined input rating: ____________________

b. Using the common vent portion of the same table used

to size the connectors, determine the size of the

common vent.

Size of common vent: ____________________


140,000 Btu/h (40,994 W)

5 inch (127 mm)

Workbook Page 133


13. Check vent terminations.

IFGC Section 503.6.4 and Table 503.6.4.

14. Check multistory installations.


15. Check direct-vent, integral vent, mechanical vent and

ventilation/ exhaust hood venting.

IFGC Section 505



455'

6'

12

18

Gas Vent Termination

▪ Determine which diagram shows correct vent

termination requirement

CorrectIncorrect,

[needs 7'6" (2286 mm)]

Workbook Page 137

Venting Systems

▪ Given the following information, size the entire

venting system.

▪ Water heater- 40,000 Btu/h (11,717 W)

Natural Draft

3-inch (76 mm) Draft hood

▪ Furnace 80,000 Btu/h (23,425 W)

Fan Assisted

4-inch (102 mm) Flue Collar


Venting Systems

Work the problem here.

A. Diameter for the water heater connector.

4 inches

B. Diameter for the furnace connector.

4 inches

C. Percent capacity reduction for common vent.

20 percent, Sections 504.3.5 and 505.3.6


Venting Systems


D. Diameter of common vent.

5 inches, (159,000 Btu/h ´ 0.80 = 127,200 Btu/h)

(46,557 W × 0.80 = 37,245.6 W)]

E. Maximum allowable horizontal connector length.

6 feet (1829 mm) or in accordance with Sections

504.3.2 and 503.10.9 the MAX Length allowed is

12.75' (3886 mm) [75% × 17' (5182 mm) =

12.75 (75% × 5182 = 3886)]134

Copyright 2009, International Code Council

Workbook Page 138

Venting Systems


F. Maximum allowable length of common vent

offset.

7.5 (191 mm)

G. Is interpolation necessary?

No



Sizing of Venting Systems for Two or

More Appliances

Workbook Page 141

Sizing of Venting Systems for Two

or More Appliances

▪ Determine the venting system sizing for the two

appliances.

▪ Find the size of the common vent based on

least total height and the combination of

connected appliances



More Appliances

Consider the system to have the following characteristics:

▪ A two-appliance FAN + NAT system, combining a water

heater (NAT) equipped with a draft hood with a fan-

assisted Category I furnace (FAN).

▪ Single-wall pipe connectors are used.

▪ Vent height is 35 feet (10 668 mm).

▪ Furnace connector rise is 4 feet (1219 mm).

▪ Water heater connector rise is 2 feet (610 mm).

▪ Furnace input is 75,000 Btu/h (21,961 W).

▪ Water heater input is 42,000 Btu/h (12,298 W).



More Appliances

A. Furnace Connector

Material:

Size:

B. Water Heater

Connector Material:

Size:

C. Common Vent Size:

▪ Type B

▪ 4 inches, [Table 504.3(1)]

▪ Single-wall

▪ 4 inches, [Table 504.3(2)]

▪ 4 inches (102 mm) [10%

reduction for offset, 132,000

Btu/h × 0.9 = 118,800

Btu/h (38,651 W × 0.9 =

34,785.9 W)]139Copyright 2009, International Code Council

Workbook Page 142

Sizing of Venting Systems for Two

or More Appliances

D. Interpolation Necessary? No

E. Any Noted Violations?


Common Vent Sizing For Two or More

Appliances

▪ Workbook page 143

▪ In groups of 3-4

▪ Answer the A through M



OF EXHAUST SYSTEMS

Module 9

1422009 IMC® Fundamentals

Six Tasks

1. Inspect for required systems compliance.

IMC Section 502.

2. Inspect motors and fans.

IMC Section 503.

3. Inspect clothes dryer exhaust. IMC Section 504.

4. Inspect commercial kitchen exhaust systems.

IMC Section 506 through 509.

5. Inspect hazardous exhaust systems.

IMC Section 510.

6. Inspect energy recovery ventilation systems.

IMC Section 514.


Task 1: Inspect for Required Systems

Compliance

1. Check exhaust location.

IMC Section 501.2.1 and 5502.1.1.

2. Check areas requiring exhaust systems.

IMC Section501.1

3. Check for recirculation.

IMC Table 403.3.

4. Check termination points.




Task 2: Inspect Motors and Fans

1. Check sizes.

IMC Section 503.1.

2. Check fan protection.

IMC Section 503.2.

3. Check fans in areas with corrosives.

IMC Section 503.4.

4. Check for required Fan Interlocks.

IMC Section 503


Task 3: Inspect Clothes Dryer Exhaust

1. Check installation.

IMC Section 504.1.

2. Check exhaust penetrations.

IMC Section 504.2.

3. Check exhaust installation.

IMC Section 504.4.


Multiple Dryer Installation


Task 4: Inspect Commercial Kitchen

Exhaust Systems

1. Check for the presence of exhaust systems where required.

IMC Section507.2, 507.2.1, 507.2.1.1 and 507.2.2

2. Check grease duct clearances.

IMC Section 506.3.6

3. Check grease duct enclosure.

IMC Section 506.3.10, 506.3.10.1, 506.3.10.2 and

506.3.10.3.

4. Check terminations through an exterior wall, if present.

IMC Section 506.3.3.12.2.


Termination Through Exterior Wall





Exhaust Systems

5. Check ducts.

IMC Section 506.1 through 506.3, 506.3.1, 506.3.1.1,

506.3.1.2 and 506.3.2.

6. Check type I hoods.


7. Check type II hoods.


8. Check type I and II materials.

IMC Section 507.4 and 507.5.



Exhaust Systems

9. Check capacity of the hoods.

IMC Section 507.13.

10. Check fuel burning appliances.

IMC Section 507.3.

11. Check commercial kitchen makeup air.

IMC Section 508.

12. Verify or observe the capture and containment test.


151Copyright 2009, International Code CouncilWorkbook Page-156-157

Canopy Hood - Elevation



Workbook Page 156

Canopy Hoods




Back-To-Back Type Canopy Hood




Makeup Air Supplied to Hood


Task 5: Inspect Hazardous Exhaust

System

1. Check for hazardous exhaust systems where required.

IMC Section 510.2.

2. Check design.

IMC Section 510.3.

3. Check operation.

IMC Section 510.3.


Task 6: Inspect Energy Recovery

Ventilation Systems

1. Check IECC compliance, if necessary.

IMC Section 514.1.

2. Check if installation is allowed.

IMC Section 514.2.



OF DUCTS AND PLENUMS

Module 10

Six Tasks

1. Inspect egress

elements.

IMC Section 601.2.

2. Inspect plenums.

IMC Section 602.

3. Inspect duct

construction and

installation.

IMC Section 603.

4. Inspect insulation.

IMC Section 604.

5. Inspect smoke

detection systems

control.

IMC Section 606.

6. Inspect ducts and air

transfer openings.

IMC Section 607.


Task 1: Inspect Egress Elements

1. Check air movement in egress elements.

IMC Section 601.2.

2. Check the corridor ceiling.


3. Check the exit enclosure for compliance.

IMC Section 601.3.

4. Check for the air movement in egress situations.


Task 2: Inspect Plenums

1. Check locations of supply, return, exhaust, relief and

ventilation air plenums.

IMC Section 602.1.

2. Check plenum construction.

IMC Section 602.2.

3. Check materials exposed within plenums.

IMC Section 602.2..1.

4. Check stud cavity and joist space plenums.

IMC Section 602.3.

5. Check for flood hazard.

IMC Section 602.4. 161Copyright 2009, International Code Council


Typical Floor/Ceiling Return and

Plenum


Mechanical Room Used as Return Air

Plenum


Acceptable Stud and Joist Space

Plenum Installation


Unacceptable Stud and Joist Space

Plenum Installation


Task 3: Inspect Duct Construction and

Installation

1. Check duct sizing.

IMC Section 603.2.

2. Check duct classification.

IMC Section 603.3.

3. Check metallic ducts.

IMC Section 603.4.

4. Check nonmetallic ducts.

IMC Section 603.5.



Installation

5. Check flexible air ducts and flexible air connections.

IMC Section 603.6.

6. Check underground ducts.

IMC Section 603.8.

7. Check duct joints and supports.


8. Check furnace connections.

IMC Section 603.11.


Flexible Connector



Installation

9. Check condensation.

IMC Section 603.12.

10. Check location.

IMC Section 603.14.

11. Check for protection.


12. Check registers, grilles and diffusers.

IMC Section 603.17.


Task 4: Inspect Insulation

1. Check for IECC compliance.

IMC Section 604.1.

2. Check surface temperature.

IMC Section 604.2.

3. Check coverings and linings.

IMC Section 604.3.

4. Check foam plastic insulation.

IMC Section 604.4.


Duct Coverings



5. Check appliance testing and labeling.

IMC Section 604.5.

6. Check penetration of assemblies.

IMC Section 604.6.

7. Check identification.

IMC Section 604.7.

8. Check lining installation.

IMC Section 604.8.



9. Check for thermal

continuity.

IMC Section 604.9.

10. Check service openings.

IMC Section 604.10.

11. Check vapor retarders.

IMC Section 604.11.

12. Check weatherproof

barriers.

IMC Section 604.12.

13. Check internal insulation.

IMC Section 604.13.


Task 5: Inspect Smoke Detection

Systems Control

1. Check that required controls are present.

IMC Section 606.1.

2. Check location of controls.

IMC Section 606.2.

3. Check installations.

IMC Section 606.3.

4. Check controls operation.

IMC Section 606.4.


Duct Smoke Detectors


Return Riser


Task 6: Inspect Ducts and Air Transfer

Openings

1. Check installation. IMC Section 607.2.

2. Verify damper testing and ratings. IMC Section 607.3.

3. Check location requirements. IMC Section 607.5.

4. Check horizontal assemblies. IMC Section 607.6.

5. Check Membrane penetrations. IMC Section 607.6.2.

6. Check flexible ducts and air connectors.IMC Section 607.7.


PERFORMING REFRIGERATION

INSPECTIONS

Module 11

Three Tasks

1. Inspect for general requirements compliance.

IMC Section 1102.1.

2. Inspect classification.

IMC Section 1102.2 and Table 1103.3 and 1103.

3. Inspect machinery room.

IMC Section 1104.2.


Task 1: Inspect for General

Requirements Compliance

1. Check factory-built equipment and appliances. IMC Section 1101.2.

2. Check for protection. IMC Section 1101.3.

3. Check water connection. IMC Section 11041.4.

4. Check fuel gas connection. IMC Section 1101.5.


Task 1: Inspect for General

Requirements Compliance (cont)

5. Check for changes in refrigerant type. IMC Section 1101.8.

6. Looking for access port caps. IMC Section 1101.10.

7. Verify field test. IMC Section 1108.


Task 2: Determine Classification

1. Determine the refrigeration system’s classification.


2. Determine the refrigerant classification.

IMC Section 1102.2 and Table 1103.1.

3. Determine the maximum allowable quantity of refrigerant.

IMC Table1103.1.

4. Determine the system enclosure requirements.

IMC Section 1103.3, 1103.3.1 and 1102.3.2.

5. Check refrigeration equipment location and installation.

IMC Section 1105 and 1106.


Low-Probability Systems


High-Probability Systems


Task 3: Inspect Machinery Room

1. Check refrigerant detector. IMC Section 1105.3.

2. Check fuel-burning appliances. IMC Section 1105.5.

3. Check rate for normal ventilation. IMC Section 1105.6.

4. Check quantity for emergency conditions. IMC Section 1105.6.4.

5. Check for compliance with special requirements. IMC Section 1106.

6. Refrigerant piping. IMC Section 1107.


GAS PIPING INSTALLATIONS

Module 12

Five Tasks

1. Inspect for proper identification.

IFGC Section 401.5.

2. Review gas piping system plan.


IFGC Section 403.

4. Inspect piping system installation.

IFGC Section 404.

5. Inspect gas flow controls.

IFGC Section 410.


Task 1: Inspect for Proper Identification

1. Check exposed gas piping. IFGC Section 403.8.

2. Check multiple meter installations. IFGC Section 401.7.


Task 2: Review Gas Piping System Plan

1. Determine maximum gas demand.

IFGC Section 402.2.

2. Determine length to most remote outlet.

IFGC Section 402.4.1 and 402.4.2.

3. Select the correct table.

IFGC Table 402.4 (1)-(35).

4. Locate gas-demand figures.

IFGC Table 402.4 (1)-(35).

5. Locate nominal size of pipe required.

IFGC Table 402.4 (1)-(35).


A Gas Piping System Plan


Gas System Sizing Problem


Outlet B40-gal Water Heater45,000 Btu/hr Outlet AClothes Dryer20,000 Btu/hr

Point ofDelivery Outlet C Range73,000 Btu/hr

Outlet DFurnace133,000 Btu/hr

15 ft15 ft20 ft

10 ft

25 ft

12 ft

5 ft 5 ftSection 4 Section 3 Section 2 15 ftSec tion 1Section 5




15 ft15 ft20 ft

10 ft

25 ft

12 ft





15 ft15 ft20 ft

10 ft

25 ft

12 ft


Outlet B40-gal Water Heater

45,000 Btu/hr

Outlet AClothes Dryer20,000 Btu/hr

Point ofDelivery

Outlet C Range73,000 Btu/hr

Outlet DFurnace

133,000 Btu/hr

15 ft15 ft

20 ft

10 ft

25 ft

12 ft

5 ft 5 ft

Section 4 Section 3

Section 215 ft

Sectio

n 1

Section 5


Workbook Page 195


1. Determine maximum gas demand:

Outlet A: 20 cfh (0.57m3/hr)

Outlet B: 45 cfh (1.27m3/hr)

Outlet C: 73 cfh (2.07m3/hr)

Outlet D: 133 cfh (3.76m3/hr)

Maximum gas demand: 271 cfh (7.86m3/hr)



2. Determine length to the most remote outlet:

Section 1: 15 ft. (4572 mm)





Total pipe length to most remote outlet: 80 ft.

(24 384 mm)



3. Select applicable table:

Specific gravity: 0.60

Gas pressure: 10 IN WC (254 mm)

Pressure drop: 0.5 IN WC (12.7 mm)

Type of material: Steel Pipe

Special conditions: NA

Table Used: 402.4(2)



4. Locate gas demand figures:

▪ Horizontal row showing length of piping

▪ Indicates length from point of delivery to most remote outlet

▪ If not exact, use next longer distance

▪ Use this row for all gas demand figures



5. Locate nominal size of pipe required:

▪ Outlet C:

▪ 73 cfh requires 3/4 inch pipe

▪ (2.07 m3/hr requires 19.1 mm)

▪ Outlet D:

▪ 133 cfh requires 1 inch pipe

▪ (3.76 m3/hr requires 25.4mm)

▪ Pipe Section 4 (A,B,C):

▪ 138 cfh requires 1 inch pipe


▪ Pipe Section 5 (A,B,C,D):

▪ 271 cfh requires 1 ¼ inch pipe



Branch Length Method

▪ Determine the size of gas piping

sections




GAS GRILL

20 MBH

CSST

20’ F

RANGE

60 MBH WATER

HEATER

40 MBH

FURNACE 75

MBH

CLOTHES DRYER 35

MBH (MBH = 1,000 Btu/h)

SCHEDULE 40 STEEL

TRUNKLINE

LONGEST RUN

15’J 15’I 15’G

H 20’

POINT OF

DELIVERY

SPECIFIC

GRAVITY

0.60

A

10’

B

10’

D15’

E5’

C25’

ALL BRANCHES

CSST

9” WC

PRESSURE


Workbook Page 197


▪ Determine the size of trunk line sections

▪ Determine load for each section of pipe

▪ A = 230 MBH

▪ B = 170 MBH

▪ C = 135 MBH

▪ D = 95 MBH

▪ E = 20 MBH

▪ Determine the table to use = 402.4(2)

▪ Because longest run length of pipe is between

rows, use next higher row.



▪ Determine the size of trunk line sections

▪ Determine size for each section of pipe

▪ A = 1 ¼ inch (31.8 mm)

▪ B = 1 inch (25.4 mm)

▪ C = 1 inch (25.4 mm)

▪ D = ¾ inch (19.1 mm)

▪ E = 3/8 inch (9.5 mm)


Check Your Learning: Answers

▪ Determine the load for the following branch

sections

▪ Section F: 20 cfh (0.71 m3/hr)

▪ Section G: 60 cfh (1.7 m3/hr)

▪ Section H: 35 cfh (0.99 m3/hr)

▪ Section I: 40 cfh (1.13 m3/hr)

▪ Section J: 75 cfh (2.12 m3/hr)



▪ Determine the length for each branch

▪ Section F: 85 ft. (25 908 mm)

▪ Section G: 25 ft. (7620 mm)

▪ Section H: 40 ft. (12 192 mm)

▪ Section I: 60 ft. (18 288 mm)

▪ Section J: 75 ft. (22 860 mm)

▪ Determine the table to use

▪ Table 402.4(13)



▪ Determine the size for each section of gas pipe.


Pipe Section Length (ft.) Load (MBH) Size

F 85 20 18

G 25 60 19

H 40 35 18

I 60 40 23

J 75 75 30

Workbook Page 201



9 INCHES

WC

METER

SERVICE

REGULATOR

5 PSIG

A

90’

SCHEDULE 40 STEEL PIPING THROUGHOUT

RTU

1

200 MBH

10’ B

“POUNDS-TO-INCHES” REGULATORS

10’ D

RTU

2150 MBH

I

20’

F

40’

C

75’

RTU

3

RTU

4

H 15’

J 15’

E 25’

10’ G

125 MBH

150 MBH

9 INCHES

WC

Workbook Page 202


Parallel System – 6” WC



▪ Required Size (CSST)

▪ A 37

▪ B 25

▪ C 19

▪ D 23

▪ E 23

▪ F 18

▪ G 18



Medium Pressure System



▪ Required Size (CSST)

▪ A 18

▪ B 15

▪ C 13

▪ D 13

▪ E 15

▪ F 13

▪ G 13



▪ Required Size (Schedule

40)

▪ A 1 ¼” (31.8 mm)

▪ B 1 ¼” (31.8 mm)

▪ C 1” (25.4 mm)

▪ D 1” (25.4 mm)

▪ E ¾” (19.1 mm)

▪ F ¾” (19.1 mm)

▪ G 1/2” (12.7 mm)


• Required Size (CSST)

– H 13

– I 23

– J 15

– K 18

– L 15

– M 18

– N 13

Workbook Page 211

Task 3: Inspect Piping Materials

1. Check corrugated stainless steel tubing.


2. Check plastic tubing.


3. Check copper tubing.


4. Check protective coating and wrapping.

IFGC Section 403.8.

5. Check number and length of threads.

IFGC Section 403.9.


Task 4: Inspect Piping System Installation

1. Check prohibited location. IFGC Section 404.1.

2. Check piping in concealed locations. IFGC Section 404.3.

3. Check piping through foundation walls is prohibited, underground penetration prohibited. IFGC Section 404.4.

4. Check protection against physical damage. IFGC Section 404.5.

5. Check piping in solid floors. IFGC Section 404.6, 404.6.1 and 404.6.2.


Piping Through Foundation Wall


Alternative Piping Through Solid Floors


Task 4: Inspect Piping System Installation

6. Check minimum burial depth.


7. Check individual outdoor appliances.


8. Check inspection, testing and purging.

IFGC Section 406.

9. Check appliance isolation.


10. Inspect gas flow control.

IFGC Section 410.


Gas Flow Controls


Gas Pressure Regulator


Task 5: Inspect Gas Flow Controls

1. Check MP regulators.

IFGC Section 410.2.

2. Check venting regulators.

IFGC Section 410.3.

3. Check appliance connections.

IFGC Section 411.1.

4. Check protection from damage.


5. Check movable appliances.



performing commercial mechanical plan reviews · performing commercial mechanical plan reviews ......

Documents