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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
3Copyright 2009, International Code Council
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
4Copyright 2009, International Code Council
Overview
▪ Reviewing Ducts and Plenums
▪ Performing Refrigeration Plan Reviews
▪ Plan Review of Gas Piping Installations
5Copyright 2009, International Code Council
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.
IMC section 107.2 (2)/IFGC Section 107.2 (2)
3. Perform the final inspection.
IMC section 107.2 (3)/IFGC Section 107.2 (3)
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.
IMC Section 107.3.3/IFGC Section 107.3.3
8Copyright 2009, International Code CouncilWorkbook Page 11-12
Performing Clearance to Combustibles
Inspections
Two tasks:
1. Inspect clearances (only one step).
IMC Section 308.2/IFGC Section 308.2
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?
11Copyright 2009, International Code CouncilWorkbook Page 14
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.
12Copyright 2009, International Code CouncilWorkbook Page 15-16
Reduced Clearance for 3 ½ -inch Brick
Wall
13Copyright 2009, International Code Council
For SI: 1 inch = 25.4 mm
Workbook Page 15-16
Reduced Clearance to Combustibles Using
Protective Assemblies
14Copyright 2009, International Code CouncilWorkbook Page 15-16
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.
IMC Section 302.4/IFGC Section 302.4
5. Inspect cutting, notching and boring in steel framing. IMC
Section 302.5/IFGC Section 302.5
15Copyright 2009, International Code Council
Workbook Page 17
Task 1: Inspect Structural Safety
1. Check for structure weakening.
IMC Section 302.3.2/IFGC Section 302.3.4
2. Check structural condition after structural alterations.
IMC Section 302.1/IFGC Section 302.1
3. Check protection of penetrations of floor/ceiling assemblies
and fire-resistance-rated assemblies.
IMC Section 302.2/IFGC Section 302.2
16Copyright 2009, International Code CouncilWorkbook Page 18
Task 2: Inspect Cutting, Notching and
Boring in Wood Framing
1. Check joist notching.
IMC Section 302.3.1/IFGC Section 302.3.2
2. Check stud cutting and notching.
IMC Section 302.3.2/IFGC Section 302.3.3
3. Check bored holes.
IMC Section 302.3.3/IFGC Section 302.3.4
4. Check engineered wood products.
IMC Section 302.3.4/IFGC Section 302.3.1
17Copyright 2009, International Code CouncilWorkbook Page 19-20
Limitations for Cutting, Notching and
Bored Holes
18Copyright 2009, International Code CouncilWorkbook Page 19-20
Bored Hole Limitations
For SI: 1 inch = 25.4 mm
19Copyright 2009, International Code CouncilWorkbook Page 19-20
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
20Copyright 2009, International Code CouncilWorkbook Page 21
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.
IMC Section 302.5.2/IFGC Section 302.6
3. Check cutting, notching and boring holes in nonstructural cold-
formed steel wall framing.
IMC Section 302.5.3/IFGC Section 302.7
21Copyright 2009, International Code CouncilWorkbook Page 22
PERFORMING APPLIANCE
INSPECTIONS
Module 3
Performing Appliance Location
Inspections
Three tasks:
1. Inspect general locations.
IMC Section 303.1/IFGC Section 303.1
2. Inspect indoor locations.
IMC Section 303.5/IFGC Section 303.5
3. Inspect outdoor locations.
IMC Section 303.6/IFGC Section 303.6
23Copyright 2009, International Code CouncilWorkbook Page 25
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
24Copyright 2009, International Code CouncilWorkbook Page 26
Task 2: Inspect Indoor Locations
1. Check room volume.
IMC Section 303.5/IFGC Section 303.5
2. Check fuel-fired furnaces and boilers installed in closets
and alcoves.
IMC Section 303.5/IFGC Section 303.5
3. Check elevator shafts.
IMC Section 303.8/IFGC Section 301.15
25Copyright 2009, International Code CouncilWorkbook Page 27
Task 3: Inspect Outdoor Locations
1. Check for outdoor listings and labels.
IMC Section 303.6/IFGC Section 303.6
26Copyright 2009, International Code CouncilWorkbook Page 27
Performing Appliance Access
Inspections
Five tasks:
1. Inspect appliances in rooms.
IMC Section 306.2/IFGC Section 306.2
2. Inspect appliances in attics.
IMC Section 306.3/IFGC Section 306.3
3. Inspect appliances under floors.
IMC Section 306.4/IFGC Section 306.4
4. Inspect equipment and appliances on roofs and elevated
structures.
IMC Section 306.5/IFGC Section 306.5
5. Inspect appliances on sloped roofs.
IMC Section 306.5.1/IFGC Section 306.5.1
27Copyright 2009, International Code CouncilWorkbook Page 28
Task 1: Inspect Appliances in Rooms
1. Check for compliance with access requirements.
IMC Section 306.2/IFGC Section 306.2
2. Check central furnaces installed in compartments or
alcoves. IMC Section 306.1.1
28Copyright 2009, International Code CouncilWorkbook Page 29
Task 2: Inspect Appliances in Attics
1. Check for compliance with access requirements.
IMC Section 306.3/IFGC Section 306.3
2. Check for compliance with electrical requirements.
IMC Section 306.4.1/IFGC Section 306.3.1
29Copyright 2009, International Code CouncilWorkbook Page 30
Attic Location Requirements
30Copyright 2009, International Code CouncilWorkbook Page 30
Task 3: Inspect Appliances Under
Floors
1. Check for compliance with access requirements.
IMC Section 306.4/IFGC Section 306.4
2. Check for compliance with electrical requirements.
IMC Section 306.4.1/IFGC Section 306.4.1
31Copyright 2009, International Code CouncilWorkbook Page 31
Task 4: Inspect Equipment and Appliances on Roofs
and Elevated Structures
1. Check for permanent approved means of access.
IMC Section 306.5/IFGC Section 306.5
2. Check for obstacles to access and access safety.
IMC Section 306.5/IFGC Section 306.5
3. Check permanent ladders.
IMC Section 306.5/IFGC Section 306.5
4. Check catwalks.
IMC Section 306.5/IFGC Section 306.5
32Copyright 2009, International Code CouncilWorkbook Page 32-33
Task 5: Inspect Sloped Roofs
1. Check for level platforms.
IMC Section 306.5.1/IFGC Section 306.5.1
2. Check platform dimensions.
IMC Section 306.5.1/IFGC Section 306.5.1
3. Check for guards on platform.
IMC Section 306.5.1/IFGC Section 306.5.1
33Copyright 2009, International Code CouncilWorkbook Page 34
Access Platform On Roof
34Copyright 2009, International Code CouncilWorkbook Page 34
Performing Appliance Installation
Inspections
Eight tasks:
1. Examine installation information.
IMC Section 304.1/IFGC Section 305.1
2. Resolve conflicts (if applicable).
IMC Section 304.2/IFGC Section 305.1
3. Inspect installations having ignition sources.
IMC Section 304.3/IFGC Section 305.3
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
35Copyright 2009, International Code CouncilWorkbook Page 35
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
36Copyright 2009, International Code CouncilWorkbook Page 35
Task 1: Examine Installation
Information
1. Check the manufacturer’s installation instructions.
IMC Section 304.1/IFGC Section 305.1
2. Check the applicable IMC/IFGC code sections.
IMC Section 304.1/IFGC Section 305.1
3. Compare the two.
37Copyright 2009, International Code CouncilWorkbook Page 36
Task 2: Resolve Conflicts
1. Identify if installation information contains conflicts.
IMC Section 304.2/IFGC Section 305.1
2. Resolve the conflict.
IMC Section 304.2/IFGC Section 305.1
38Copyright 2009, International Code CouncilWorkbook Page 37
Task 3: Inspect Installations Having
Ignition Sources
1. Check if the ignition source is located in a hazardous
location or other listed locations.
IMC Section 304.3/IFGC Section 305.3
2. Check the elevation of ignition source.
IMC Section 304.3/IFGC Section 305.3
39Copyright 2009, International Code CouncilWorkbook Page 38
Oil-fired Water Heater Installation in a
Hazardous Area
For SI: 1 inch = 25.4 mm
40Copyright 2009, International Code CouncilWorkbook Page 38
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
41Copyright 2009, International Code CouncilWorkbook Page 39-40
Task 5: Inspect Garages
1. Check public garages.
IMC Section 304.6/IFGC 305.4
2. Check private garages.
IMC Section 304.7/IFGC 305.5
42Copyright 2009, International Code CouncilWorkbook Page 41
Appliance Installation in a Public
Garage
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm.
43Copyright 2009, International Code Council
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
44Copyright 2009, International Code CouncilWorkbook Page 41
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
45Copyright 2009, International Code CouncilWorkbook Page 42
Guards
46Copyright 2009, International Code CouncilWorkbook Page 42
Guards – Plan View
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm
47Copyright 2009, International Code CouncilWorkbook Page 42
Task 8: Verify Clearance from Grade
1. Check for appliance supports
IMC Section 304.10/IFGC Section 305.7
48Copyright 2009, International Code CouncilWorkbook Page 43
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
50Copyright 2009, International Code CouncilWorkbook Page 45
Task 1: Inspect Masonry Fireplaces
▪ One step: Check that masonry fireplaces are built according
to the IBC.
IMC Section 902.1
51Copyright 2009, International Code CouncilWorkbook Page 47
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
52Copyright 2009, International Code CouncilWorkbook Page 47-48
Typical Factory-build Fireplace With
Hearth
53Copyright 2009, International Code Council
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
54Copyright 2009, International Code CouncilWorkbook Page 48-49
PERFORMING INSPECTIONS
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
56Copyright 2009, International Code CouncilWorkbook Page 51
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
57Copyright 2009, International Code CouncilWorkbook Page 53
Performing Inspections of Refrigerant
Piping
Three tasks:
1. Inspect piping materials.
IMC Section 1107
2. Inspect joints.
IMC Section 1107.6/IFGC Section 1107.7
3. Inspect stop valves.
IMC Section 1107.8
58Copyright 2009, International Code CouncilWorkbook Page 59
Performing Inspections of Condensate
Piping
Three tasks:
1. Inspect fuel-burning appliances.
IMC Section 307.1/IFGC Section 307.2
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.
IMC Section 307.2/IFGC Section 307.1
59Copyright 2009, International Code CouncilWorkbook Page 63
Task 1: Inspect Fuel Burning
Appliance Drain
1. Check collection and discharge.
IMC Section 307.1/IFGC Section 307.2.
2. Check horizontal slope.
IMC Section 307.1/IFGC Section 307.2.
3. Check for corrosion resistance.
IMC Section 307.1/IFGC Section 307.3.
4. Check drain size. IMC Section 307.2.2 and Table 37.2.2/IFGC Section 307.3.
60Copyright 2009, International Code CouncilWorkbook Page 64
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.
IMC Section 307.2.2/IFGC Section 307.3.
3. Check condensate waste and drain line size.
IMC Section 307.2.2and Table 307.2.2/IFGC Section .
61Copyright 2009, International Code CouncilWorkbook Page 65
Task 3: Inspect Evaporators and
Cooling Coils
1. Check condensate disposal point.
IMC Section 307.2.1
2. Check auxiliary and secondary drain systems.
IMC Section 307.2.3/IFGC Section 307.5.
3. Check traps.
IMC Section 307.2.4/IFGC Section 307.4.
62Copyright 2009, International Code CouncilWorkbook Page 66
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.
63Copyright 2009, International Code CouncilWorkbook Page 67
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 .
64Copyright 2009, International Code CouncilWorkbook Page 68-70
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
65Copyright 2009, International Code CouncilWorkbook Page 75-76
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
67Copyright 2009, International Code CouncilWorkbook Page 77
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.
68Copyright 2009, International Code CouncilWorkbook Page 79-80
Air Intake Opening Locations
69Copyright 2009, International Code Council
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm
Workbook Page 79-80
Task 2: Inspect Openings
▪ One step – Check Intake opening.
IMC Section 401.4 and 501.2.1
70Copyright 2009, International Code CouncilWorkbook Page 81-82
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.
71Copyright 2009, International Code CouncilWorkbook Page 83
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
72Copyright 2009, International Code CouncilWorkbook Page 84-89
An Energy-conserving Alternative to
Natural Ventilation
73Copyright 2009, International Code CouncilWorkbook Page 84-89
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.
75Copyright 2009, International Code CouncilWorkbook Page 91
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.
77Copyright 2009, International Code CouncilWorkbook Page 92
All Air from Inside the Building
78Copyright 2009, International Code CouncilWorkbook Page 92
Performing Inspections for Outdoor
Air (Gas) Provisions
Three tasks:
1. Inspect air opening dimensions.
IFGC Section 304.6.
2. Inspect two-permanent-opening method.
IFGC Section 304.6.1.
3. Inspect one-permanent-opening method.
IFGC Section 304.6.2.
79Copyright 2009, International Code CouncilWorkbook Page 95
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.
80Copyright 2009, International Code CouncilWorkbook Page 96
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
81Copyright 2009, International Code CouncilWorkbook Page 96
Inlet Air from Ventilated Crawl Space and
Outlet Air to Ventilated Attic
82Copyright 2009, International Code CouncilWorkbook Page 96
Inlet Air from Inlet Duct and Outlet Air
to Ventilated Attic
83Copyright 2009, International Code Council
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm
Workbook Page 96
All Air from Outdoors
84Copyright 2009, International Code CouncilWorkbook Page 96
Task 3: Inspect One-Permanent-
Opening Method
1. Check opening location.
IFGC Section 304.6.2.
2. Check communication to the outdoors.
IFGC Section 304.7.1.
3. Check clearances.
IFGC Section 304.7.1.
85Copyright 2009, International Code CouncilWorkbook Page 97
One-Permanent-Opening Method, All
Air from the Outdoors
86Copyright 2009, International Code CouncilWorkbook Page 97
Performing Inspections of Combination
Indoor/Outdoor Air
Three tasks:
1. Inspect indoor openings.
IFGC Section 304.7.1.
2. Inspect outdoor opening location.
IFGC Section 304.7.2.
3. Inspect outdoor opening(s) size.
IFGC Section 304.7.3.
87Copyright 2009, International Code CouncilWorkbook Page 98
Task 1: Inspect Indoor Openings
1. Check for the minimum free area.
IFGC Section 304.7.3.
2. Check opening locations.
IFGC Section 304.7.3.
88Copyright 2009, International Code CouncilWorkbook Page 98
Task 2: Inspect Outdoor Opening
Location
One step – Check opening locations.
IFGC Section 304.7.3 and 304.10
89Copyright 2009, International Code CouncilWorkbook Page 99
Task 3: Inspect Outdoor Opening(s)
Size
One step – Check outdoor opening sizes.
IFGC Section 304.6,304.6.1 and 304.6.2.
90Copyright 2009, International Code CouncilWorkbook Page 99
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.
91Copyright 2009, International Code CouncilWorkbook Page 100
Task 1: Inspect Engineered Systems
One step – Verify that engineered systems meet the
intent of the code.
IFGC Section 304.8.
92Copyright 2009, International Code CouncilWorkbook Page 100
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.
IFGC Section 304.9.2.
4. Check combined combustion air and ventilation air system.
IFGC Section 304.9.3.
93Copyright 2009, International Code CouncilWorkbook Page 101
Mechanical Combustion Air Supply
System
94Copyright 2009, International Code CouncilWorkbook Page 101
Mechanical Combustion Makeup Air
Supply System
95Copyright 2009, International Code CouncilWorkbook Page 101
Mechanical Combustion Makeup Air
Supply System
96Copyright 2009, International Code CouncilWorkbook Page 101
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.
98Copyright 2009, International Code CouncilWorkbook Page 103
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.
99Copyright 2009, International Code CouncilWorkbook Page 105
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.
101Copyright 2009, International Code CouncilWorkbook Page 106
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.
IFGC Section 503.5.6.
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
102Copyright 2009, International Code CouncilWorkbook Page 107-112
Decorative Shrouds
103Copyright 2009, International Code CouncilWorkbook Page 107-112
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
104Copyright 2009, International Code CouncilWorkbook Page 107-112
Vent System Performance Factors
105Copyright 2009, International Code CouncilWorkbook Page 107-112
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.
106Copyright 2009, International Code CouncilWorkbook Page 113-115
Connectors
107Copyright 2009, International Code CouncilWorkbook Page 113-115
Vent System
Which vent system is designed more efficiently?
108Copyright 2009, International Code Council
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
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm
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
109Copyright 2009, International Code CouncilWorkbook Page 115
Connector Length Limit
110Copyright 2009, International Code Council
A 3" diameter
B 4" diameter
C 6" diameter
2.5'
4.5'
2'
1'
9.5'
FANOR
DRAFTHOOD
APPLIANCEDRAFTHOODDRAFTHOOD
DRAFTHOOD
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm
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
111Copyright 2009, International Code CouncilWorkbook Page 117
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.
IFGC Section 504.3.6.
9. Check for connector capacity reduction.
IFGC Section 504.3.3.
10. Check seven times rule.
IFGC Section 504.2.8.
112Copyright 2009, International Code CouncilWorkbook Page 117-123
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.
113Copyright 2009, International Code CouncilWorkbook Page 117
Length Alternative
114Copyright 2009, International Code Council
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
115Copyright 2009, International Code CouncilWorkbook Page 118
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
116Copyright 2009, International Code CouncilWorkbook Page 119
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
117Copyright 2009, International Code CouncilWorkbook Page 119
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)
118Copyright 2009, International Code Council
(A/B × C) + D
(2.5/5 × 30) + 195 =
1/2 × 30) + 195 =
15 + 195 = 210
Workbook Page 119
Offsets
119Copyright 2009, International Code CouncilWorkbook Page 122
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.
120Copyright 2009, International Code CouncilWorkbook Page 123
Task 5: Inspect Appliance Venting
1. Check sizing of category I appliance venting systems.
IFGC Section504.2.2.
2. Check sizing of venting systems for a single appliance.
IFGC Section 504.2.2.
3. Check minimum size.
IFGC Section 504.2.2 (1-5).
4. Check vent offsets.
IFGC 504.2.3.
121Copyright 2009, International Code CouncilWorkbook Page 124-125
Task 5: Inspect Appliance Venting
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.
IFGC Section 504.2.8.
122Copyright 2009, International Code CouncilWorkbook Page 126
Task 5: Inspect Appliance Venting
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
Workbook Page 127-132
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)
124Copyright 2009, International Code CouncilWorkbook Page 128
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
125Copyright 2009, International Code CouncilWorkbook Page 128
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.
126Copyright 2009, International Code Council
(A/B × C) + D
(2.5/5 × 30) + 195
(1/2 × 30) + 195
15 + 195 = 210
Workbook Page 128
Sizing Type B Vent System
127Copyright 2009, International Code CouncilWorkbook Page 131
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
Sizing Type B Vent System
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: ____________________
129Copyright 2009, International Code Council
140,000 Btu/h (40,994 W)
5 inch (127 mm)
Workbook Page 133
Task 5: Inspect Appliance Venting
13. Check vent terminations.
IFGC Section 503.6.4 and Table 503.6.4.
14. Check multistory installations.
IFGC Section503.6.10.
15. Check direct-vent, integral vent, mechanical vent and
ventilation/ exhaust hood venting.
IFGC Section 505
130Copyright 2009, International Code CouncilWorkbook Page 135-146
131Copyright 2009, International Code Council
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
132Copyright 2009, International Code CouncilWorkbook Page 138
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
133Copyright 2009, International Code CouncilWorkbook Page 138
Venting Systems
Work the problem here.
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
Work the problem here.
F. Maximum allowable length of common vent
offset.
7.5 (191 mm)
G. Is interpolation necessary?
No
135Copyright 2009, International Code CouncilWorkbook Page 138
136Copyright 2009, International Code Council
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
137Copyright 2009, International Code CouncilWorkbook Page 141
Sizing of Venting Systems for Two or
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).
138Copyright 2009, International Code CouncilWorkbook Page 141
Sizing of Venting Systems for Two or
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?
140Copyright 2009, International Code CouncilWorkbook Page 142
Common Vent Sizing For Two or More
Appliances
▪ Workbook page 143
▪ In groups of 3-4
▪ Answer the A through M
141Copyright 2009, International Code CouncilWorkbook Page 143
PERFORMING INSPECTIONS
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.
143Copyright 2009, International Code CouncilWorkbook Page 147
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.
IMC Section 501.2.1.
144Copyright 2009, International Code Council
Workbook Page 149-150
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
145Copyright 2009, International Code CouncilWorkbook Page 151
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.
146Copyright 2009, International Code CouncilWorkbook Page 152-153
Multiple Dryer Installation
147Copyright 2009, International Code CouncilWorkbook Page 152-153
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.
148Copyright 2009, International Code CouncilWorkbook Page 154-155
Termination Through Exterior Wall
149Copyright 2009, International Code Council
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm
Workbook Page 154-155
Task 4: Inspect Commercial Kitchen
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.
IMC Section 507.2.1.
7. Check type II hoods.
IMC Section 507.2.2.
8. Check type I and II materials.
IMC Section 507.4 and 507.5.
150Copyright 2009, International Code CouncilWorkbook Page 155-156
Task 4: Inspect Commercial Kitchen
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.
IMC Section 507.16.1.
151Copyright 2009, International Code CouncilWorkbook Page-156-157
Canopy Hood - Elevation
152Copyright 2009, International Code Council
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm
Workbook Page 156
Canopy Hoods
153Copyright 2009, International Code Council
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm
Workbook Page 156-157
Back-To-Back Type Canopy Hood
154Copyright 2009, International Code Council
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm
Workbook Page 156-157
Makeup Air Supplied to Hood
155Copyright 2009, International Code CouncilWorkbook Page 156-157
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.
156Copyright 2009, International Code CouncilWorkbook Page 158
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.
157Copyright 2009, International Code CouncilWorkbook Page 159
PERFORMING INSPECTIONS
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.
159Copyright 2009, International Code CouncilWorkbook Page 161
Task 1: Inspect Egress Elements
1. Check air movement in egress elements.
IMC Section 601.2.
2. Check the corridor ceiling.
IMC Section 601.2.1.
3. Check the exit enclosure for compliance.
IMC Section 601.3.
4. Check for the air movement in egress situations.
160Copyright 2009, International Code CouncilWorkbook Page 162-163
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
Workbook Page 164-165
Typical Floor/Ceiling Return and
Plenum
162Copyright 2009, International Code CouncilWorkbook Page 164-165
Mechanical Room Used as Return Air
Plenum
163Copyright 2009, International Code CouncilWorkbook Page 164-165
Acceptable Stud and Joist Space
Plenum Installation
164Copyright 2009, International Code CouncilWorkbook Page 164-165
Unacceptable Stud and Joist Space
Plenum Installation
165Copyright 2009, International Code CouncilWorkbook Page 164-165
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.
166Copyright 2009, International Code CouncilWorkbook Page 166-167
Task 3: Inspect Duct Construction and
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.
IMC Section 603.9 and 603.10.
8. Check furnace connections.
IMC Section 603.11.
167Copyright 2009, International Code CouncilWorkbook Page 167-168
Flexible Connector
168Copyright 2009, International Code CouncilWorkbook Page 167-168
Task 3: Inspect Duct Construction and
Installation
9. Check condensation.
IMC Section 603.12.
10. Check location.
IMC Section 603.14.
11. Check for protection.
IMC Section 603.15 and 603.16.
12. Check registers, grilles and diffusers.
IMC Section 603.17.
169Copyright 2009, International Code CouncilWorkbook Page 168-169
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.
170Copyright 2009, International Code CouncilWorkbook Page 170-171
Duct Coverings
171Copyright 2009, International Code CouncilWorkbook Page 170-171
Task 4: Inspect Insulation
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.
172Copyright 2009, International Code CouncilWorkbook Page 171
Task 4: Inspect Insulation
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.
173Copyright 2009, International Code CouncilWorkbook Page 171-172
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.
174Copyright 2009, International Code CouncilWorkbook Page 173-174
Duct Smoke Detectors
175Copyright 2009, International Code CouncilWorkbook Page 173-174
Return Riser
176Copyright 2009, International Code CouncilWorkbook Page 173-174
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.
177Copyright 2009, International Code CouncilWorkbook Page 175-176
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.
179Copyright 2009, International Code CouncilWorkbook Page 177
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.
180Copyright 2009, International Code CouncilWorkbook Page 178
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.
181Copyright 2009, International Code CouncilWorkbook Page 179
Task 2: Determine Classification
1. Determine the refrigeration system’s classification.
IMC Section 1102.1 and 1103.1.
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.
182Copyright 2009, International Code CouncilWorkbook Page 180-185
Low-Probability Systems
183Copyright 2009, International Code CouncilWorkbook Page 180-185
High-Probability Systems
184Copyright 2009, International Code CouncilWorkbook Page 180-185
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.
185Copyright 2009, International Code CouncilWorkbook Page 186-187
GAS PIPING INSTALLATIONS
Module 12
Five Tasks
1. Inspect for proper identification.
IFGC Section 401.5.
2. Review gas piping system plan.
3. Inspect piping materials.
IFGC Section 403.
4. Inspect piping system installation.
IFGC Section 404.
5. Inspect gas flow controls.
IFGC Section 410.
187Copyright 2009, International Code CouncilWorkbook Page 189
Task 1: Inspect for Proper Identification
1. Check exposed gas piping. IFGC Section 403.8.
2. Check multiple meter installations. IFGC Section 401.7.
188Copyright 2009, International Code CouncilWorkbook Page 190
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).
189Copyright 2009, International Code CouncilWorkbook Page 191
A Gas Piping System Plan
190Copyright 2009, International Code CouncilWorkbook Page 193
Gas System Sizing Problem
191Copyright 2009, International Code Council
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
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
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
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
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm
Workbook Page 195
Gas System Sizing Problem
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)
192Copyright 2009, International Code CouncilWorkbook Page 195
Gas System Sizing Problem
2. Determine length to the most remote outlet:
Section 1: 15 ft. (4572 mm)
Section 2: 25 ft. (7620 mm)
Section 3: 5 ft. (1524 mm)
Section 4: 5 ft. (1524 mm)
Section 5: 30 ft. (9144 mm)
Total pipe length to most remote outlet: 80 ft.
(24 384 mm)
193Copyright 2009, International Code CouncilWorkbook Page 196
Gas System Sizing Problem
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)
194Copyright 2009, International Code CouncilWorkbook Page 196
Gas System Sizing Problem
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
195Copyright 2009, International Code CouncilWorkbook Page 196
Gas System Sizing Problem
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
▪ (3.91 m3/hr requires 25.4mm)
▪ Pipe Section 5 (A,B,C,D):
▪ 271 cfh requires 1 ¼ inch pipe
▪ (7.67 m3/hr requires 31.8mm)
196Copyright 2009, International Code CouncilWorkbook Page 196
Branch Length Method
▪ Determine the size of gas piping
sections
197Copyright 2009, International Code CouncilWorkbook Page 197
Branch Length Method
198Copyright 2009, International Code Council
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
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm
Workbook Page 197
Branch Length Method
▪ 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.
199Copyright 2009, International Code CouncilWorkbook Page 198
Branch Length Method
▪ 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)
200Copyright 2009, International Code CouncilWorkbook Page 198
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)
201Copyright 2009, International Code CouncilWorkbook Page 201
Check Your Learning: Answers
▪ 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)
202Copyright 2009, International Code CouncilWorkbook Page 201
Check Your Learning: Answers
▪ Determine the size for each section of gas pipe.
203Copyright 2009, International Code Council
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
Check Your Learning: Answers
204Copyright 2009, International Code Council
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
Check Your Learning: Answers
Parallel System – 6” WC
205Copyright 2009, International Code CouncilWorkbook Page 205
Check Your Learning: Answers
▪ Required Size (CSST)
▪ A 37
▪ B 25
▪ C 19
▪ D 23
▪ E 23
▪ F 18
▪ G 18
206Copyright 2009, International Code CouncilWorkbook Page 205
Check Your Learning: Answers
Medium Pressure System
207Copyright 2009, International Code CouncilWorkbook Page 207
Check Your Learning: Answers
▪ Required Size (CSST)
▪ A 18
▪ B 15
▪ C 13
▪ D 13
▪ E 15
▪ F 13
▪ G 13
208Copyright 2009, International Code CouncilWorkbook Page 207
Check Your Learning: Answers
Branch Length Method
209Copyright 2009, International Code CouncilWorkbook Page 211
Check Your Learning: Answers
▪ 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)
210Copyright 2009, International Code Council
• Required Size (CSST)
– H 13
– I 23
– J 15
– K 18
– L 15
– M 18
– N 13
Workbook Page 211
211Copyright 2009, International Code CouncilWorkbook Page 212
Task 3: Inspect Piping Materials
1. Check corrugated stainless steel tubing.
IFGC Section 403.5.4.
2. Check plastic tubing.
IFGC Section 403.11.
3. Check copper tubing.
IFGC Section 403.5.2.
4. Check protective coating and wrapping.
IFGC Section 403.8.
5. Check number and length of threads.
IFGC Section 403.9.
212Copyright 2009, International Code CouncilWorkbook Page 213-215
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.
213Copyright 2009, International Code CouncilWorkbook Page 216-217
Piping Through Foundation Wall
214Copyright 2009, International Code CouncilWorkbook Page 216-217
Alternative Piping Through Solid Floors
215Copyright 2009, International Code CouncilWorkbook Page 216-217
Task 4: Inspect Piping System Installation
6. Check minimum burial depth.
IFGC Section 404.10.
7. Check individual outdoor appliances.
IFGC Section 404.10.1.
8. Check inspection, testing and purging.
IFGC Section 406.
9. Check appliance isolation.
IFGC Section 406.3.2.
10. Inspect gas flow control.
IFGC Section 410.
216Copyright 2009, International Code CouncilWorkbook Page 218-220
Gas Flow Controls
217Copyright 2009, International Code CouncilWorkbook Page 218-220
Gas Flow Controls
218Copyright 2009, International Code CouncilWorkbook Page 218-220
Gas Pressure Regulator
219Copyright 2009, International Code CouncilWorkbook Page 218-220
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.
IFGC Section 411.1.2.
5. Check movable appliances.
IFGC Section 411.1.4.
220Copyright 2009, International Code CouncilWorkbook Page 221-223
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