2012 IMC Performing Commercial Mechanical Inspections

Transcription

1 2012 IMC Performing Commercial Mechanical Inspections Based Primarily on the 2012 International Mechanical Code (IMC ) and the 2012 International Fuel Gas Code (IFGC ) as applicable. `

2 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? 2012 IMC Performing Commercial Mechanical Inspection 2

3 Overview General Mechanical Inspection Performing Appliance Inspection Performing Inspections of Fireplaces and Solid Fuel Appliances Performing Inspections of Piping Systems 2012 IMC Performing Commercial Mechanical Inspection 3

4 Overview Performing Ventilation Inspections Performing Inspections of Combustion Air Provisions (Gas) and NonGas Performing Venting Systems Inspections Performing Inspections of Exhaust Systems 2012 IMC Performing Commercial Mechanical Inspection 4

5 Overview Performing Inspections of Ducts and Plenums Performing Refrigeration Inspections Performing Inspections of Gas Piping Installations 2012 IMC Performing Commercial Mechanical Inspection 5

6 Objectives Upon completion of this seminar, you will be better able to: Define basic terms related to a commercial mechanical inspection. Describe the mechanical inspection process in a step-by-step fashion. Explain concepts of specific requirements. Determine if a given commercial occupancy complies with the 2012 IMC and 2012 IFGC IMC Performing Commercial Mechanical Inspection 6 Workbook Page 1

7 Objectives Upon completion of this seminar, you will be better able to: Locate and apply mechanical code requirements. Complete inspection checklists. Utilize the 2012 IMC and 2012 International Fuel Gas Code (IFGC) to conduct commercial building inspections IMC Performing Commercial Mechanical Inspection 7 Workbook Page 1

8 Module 1 General Mechanical Inspection 2012 IMC Performing Commercial Mechanical Inspection 8

9 Performing Required General Inspections 1. Check underground installations. IMC and IFGC Section Check rough-in components. IMC and IFGC Section Perform the final inspection. IMC and IFGC Section Review evaluations and inspection reports. IMC and IFGC Section IMC Performing Commercial Mechanical Inspection 9 Workbook Page 9-10

10 Observing/Verifying Tests IMC and IFGC Section Check for proper testing apparatus IMC and IFGC Section Verify and/or observe tests. IMC and IFGC Section Retest failures. IMC and IFGC Section IMC Performing Commercial Mechanical Inspection 10 Workbook Page 11-12

11 Performing Clearance to Combustibles Inspections IMC and IFGC Section 308 Two tasks: 1. Inspect clearances All IMC and IFGC Section Inspect clearance reduction methods. IMC and IFGC Table IMC Performing Commercial Mechanical Inspection 11 Workbook Page 13

12 How To Measure IMC Table 308.6/IFGC Table IMC Performing Commercial Mechanical Inspection 12 Workbook Page 14

13 Task 1: Inspect Clearances IMC and IFGC Section 308 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? 2012 IMC Performing Commercial Mechanical Inspection 13 Workbook Page 14

14 Task 2: Inspect Clearance Reduction 1. Check that reduction is allowed. IMC Section Check listed appliances and equipment. 3. Check protective assembly construction and installation. IMC Section Check allowable reduction IMC Performing Commercial Mechanical Inspection 14 Workbook Page 15-16

15 Reduced Clearance for 3 ½ -inch Brick Wall From IMC Table and IFGC Table For SI: 1 inch = 25.4 mm 2012 IMC Performing Commercial Mechanical Inspection 15 Workbook Page 15-16

16 Reduced Clearance to Combustibles Using Protective Assemblies 2012 IMC Performing Commercial Mechanical Inspection 16 Workbook Page 15-16

17 Performing Protection of Structure Inspections IMC and IFGC Section 302 Four tasks: 1. Inspect structural safety. IMC and IFGC Section Inspect cutting, notching and boring in wood framing. IMC and IFGC Section Inspect alterations to trusses. IMC and IFGC Section Inspect cutting, notching and boring in steel framing. IMC and IFCGC Section IMC Performing Commercial Mechanical Inspection 17 Workbook Page 17

18 Task 1: Inspect Structural Safety 1. Check for structure weakening. IMC Section /IFGC Section Check structural condition after structural alterations. IMC and IFGC Section Check protection of penetrations of floor/ceiling assemblies and fire-resistance-rated assemblies. IMC Section and IFGC IMC Performing Commercial Mechanical Inspection 18 Workbook Page 18

19 Task 2: Inspect Cutting, Notching and Boring in Wood Framing 1. Check joist notching. IMC Section /IFGC Section Check stud cutting and notching. IMC Section /IFGC Section Check bored holes. IMC Section /IFGC Section Check engineered wood products. IMC Section /IFGC Section IMC Performing Commercial Mechanical Inspection 19 Workbook Page 19-20

20 Limitations for Cutting, Notching and Bored Holes 2012 IMC Performing Commercial Mechanical Inspection 20 Workbook Page 19-20

21 Bored Hole Limitations 2012 IMC Performing Commercial Mechanical Inspection 21 Workbook Page 19-20

22 Task 3: Inspect Alterations to Trusses 1. Check truss condition. IMC and IFGC Section Check for alterations that add to loads of trusses. IMC and IFGC Section IMC Performing Commercial Mechanical Inspection 22 Workbook Page 21

23 Task 4: Inspect Cutting, Notching and Boring in Steel Framing 1. Check cutting, notching and boring holes in structural steel framing. IMC Section /IFGC Section Check cutting, notching and boring holes in cold-formed steel framing. IMC Section /IFGC Section Check cutting, notching and boring holes in nonstructural cold-formed steel wall framing. IMC Section /IFGC Section IMC Performing Commercial Mechanical Inspection 23 Workbook Page 22

24 Module 2 Performing Appliance Inspections 2012 IMC Performing Commercial Mechanical Inspection 24

25 Performing Appliance Location Inspections IMC and IFGC Section 303 Three tasks: 1. Inspect general locations. IM and IFGC Section Inspect indoor locations. IMC and IFGC Section Inspect outdoor locations. IMC and IFGC Section IMC Performing Commercial Mechanical Inspection 25 Workbook Page 25

26 Task 1: Inspect General Locations 1. Check for hazardous locations. IMC and IFGC Section Check for prohibited locations. IMC and IFGC Section Check for protection from damage. IMC and IFGC Section IMC Performing Commercial Mechanical Inspection 26 Workbook Page 26

27 Task 2: Inspect Indoor Locations 1. Check room volume. IMC and IFGC Section Check fuel-fired furnaces and boilers installed in closets and alcoves. IMC Section Check elevator shafts. IMC Section 303.8/IFGC Section IMC Performing Commercial Mechanical Inspection 27 Workbook Page 27

28 Task 3: Inspect Outdoor Locations Check for outdoor listings and labels. Verify that any appliances that are installed outdoors are listed and labeled for outdoor installation or are protected as required IMC and IFGC Section IMC Performing Commercial Mechanical Inspection 28 Workbook Page 27

29 Public Garage IMC Section 304.6/IFGC Section Public 8 ft. Min. 1 ft. above higher than the tallest vehicle IMC Performing Commercial Mechanical Inspection 29

30 Private Garage IMC Section 304.6/IFGC Section IMC Performing Commercial Mechanical Inspection 30

31 Performing Appliance Access Inspections Five tasks: 1. Inspect appliances in rooms. IMC and IFGC Section Inspect appliances in attics. IMC and IFGC Section Inspect appliances under floors. IMC and IFGC Section Inspect equipment and appliances on roofs and elevated structures. IMC and IFGC Section Inspect appliances on sloped roofs. IMC and IFGC Section IMC Performing Commercial Mechanical Inspection 31 Workbook Page 28

32 Task 1: Inspect Appliances in Rooms IMC and IFGC Section Check for compliance with access requirements. IMC and IFGC Sections thru Check central furnaces installed in compartments or alcoves. IMC Section IMC Performing Commercial Mechanical Inspection 32 Workbook Page 29

33 Task 2: Inspect Appliances in Attics IMC and IFGC Section Check for compliance with access requirements. IMC and IFGC Section Check for compliance with electrical requirements. IMC Section /IFGC Section IMC Performing Commercial Mechanical Inspection 33 Workbook Page 30

34 Attic Location Requirements 2012 IMC Performing Commercial Mechanical Inspection 34 Workbook Page 30

35 Task 3: Inspect Appliances Under Floors IMC and IFGC Section Check for compliance with access requirements. IMC and IFGC Section Check for compliance with electrical requirements. IMC and IFGC Section IMC Performing Commercial Mechanical Inspection 35 Workbook Page 31

36 Task 4: Inspect Equipment and Appliances on Roofs and Elevated Structures 1. Check for permanent approved means of access. IMC and IFGC Section Check for obstacles to access and access safety. IMC and IFGC Section Check permanent ladders. IMC and IFGC Section Check catwalks. IMC and IFGC Section IMC Performing Commercial Mechanical Inspection 36 Workbook Page 32-33

37 Task 5: Inspect Sloped Roofs IMC and IFGC Section Check for level platforms. 2. Check platform dimensions. 3. Check for guards on platform IMC Performing Commercial Mechanical Inspection 37 Workbook Page 34

38 Access Platform On Roof 2012 IMC Performing Commercial Mechanical Inspection 38 Workbook Page 34

39 Guards 2012 IMC Performing Commercial Mechanical Inspection 39

40 Performing Appliance Installation Inspections Eight tasks: 1. Examine installation information. IMC Section 304.1/IFGC Section Resolve conflicts (if applicable). IMC Section 304.2/IFGC Section Inspect installations having ignition sources. IMC Section 304.3/IFGC Section Inspect ventilation for hydrogen generating and refueling operations. IMC Section /IFGC Section IMC Performing Commercial Mechanical Inspection 40 Workbook Page 35

41 Performing Appliance Installation Inspections Eight tasks (cont.): 5. Inspect garages. IMC Section /IFGC Section Inspect for boiler and furnace rooms. IMC Section or IFGC Section Inspect for Guards IMC Section /IFGC Section Verify clearance from grade. IMC Section /IFGC Section IMC Performing Commercial Mechanical Inspection 41 Workbook Page 35

42 Task 1: Examine Installation Information 1. Check the manufacturer s installation instructions. IMC Section 304.1/IFGC Section Check the applicable IMC/IFGC code sections. IMC Section 304.1/ IFGC Section Compare the two IMC Performing Commercial Mechanical Inspection 42 Workbook Page 36

43 Task 2: Resolve Conflicts IMC Section or IFGC Section Identify if installation information contains conflicts. IMC Section 304.2/IFGC Section Resolve the conflict. IMC Section 304.2/IFGC Section IMC Performing Commercial Mechanical Inspection 43 Workbook Page 37

44 Task 3: Inspect Installations Having Ignition Sources IMC Section or IFGC Section Check if the ignition source is located in a hazardous location.. IMC Section 304.3/IFGC Section Check the elevation of ignition source. IMC Section 304.3/IFGC Section IMC Performing Commercial Mechanical Inspection 44 Workbook Page 38

45 Oil-fired Water Heater Installation in a Hazardous Area 2012 IMC Performing Commercial Mechanical Inspection 45 Workbook Page 38

46 Task 4: Inspect Ventilation for Hydrogen Generating and Refueling Operations IMC Section or IFGC Section Check for compliance with code requirements. IMC Section 304.4/IFGC Check natural ventilation IMC Section 304.5/IFGC Check mechanical ventilation IMC Section /IFGC Check specially engineered installations (if applicable). IMC Section /IFGC IMC Performing Commercial Mechanical Inspection 46 Workbook Page 39-40

47 Task 5: Inspect Garages IMC Section or IFGC Section Check public garages. IMC Section 304.6/IFGC Check private garages. IMC Section 304.7/IFGC IMC Performing Commercial Mechanical Inspection 47 Workbook Page 41

48 Appliance Installation in a Public Garage IMC Performing Commercial Mechanical Inspection 48 Workbook Page 41

49 Task 6: Inspect Boiler and Furnace Rooms IMC Section 304.8/IFGC Section Verify that boiler and furnace rooms are protected as required by the International Building Code. IMC Section 304.8/IFGC Section IMC Performing Commercial Mechanical Inspection 49 Workbook Page 41

50 Task 7: Inspect for Guards IMC Section or IFGC Section Check that guards are present where required. 2. Check guard extensions. 3. Check the top of the guard(s). 4. Check guard construction IMC Performing Commercial Mechanical Inspection 50 Workbook Page 42

51 Guards 2012 IMC Performing Commercial Mechanical Inspection 51 Workbook Page 42

52 Guards Plan View 2012 IMC Performing Commercial Mechanical Inspection 52 Workbook Page 42

53 Task 8: Verify Clearance from Grade IMC Section and IFGC Section Check for appliance supports A. Verify that these appliances and equipment are installed on a level concrete slab or other approved material extending not less than 3 inches (76 mm) above adjoining grade. OR B. Verify that the appliance or equipment is suspended at least 6 inches (152 mm) above adjoining grade IMC Performing Commercial Mechanical Inspection 53 Workbook Page 43

54 Module 3 Performing Inspections of Fireplaces and Solid Fuel Appliances 2012 IMC Performing Commercial Mechanical Inspection 54

55 Performing Inspections of Fireplaces and Solid Fuel-burning Appliances Tasks Inspect masonry fireplaces. IMC Section Inspect factory-built fireplaces. IMC Section (Section NEW) Inspect fireplace stoves and room heaters, pellet fuel appliances, and barbecue appliances. IMC Section IMC Performing Commercial Mechanical Inspection 55 Workbook Page 45

56 Task 1: Inspect Masonry Fireplaces IMC Section 902 Check that masonry fireplaces are built according to the IBC. Verify that any masonry fireplaces comply with the masonry construction provisions of the IBC. IMC Section IMC Performing Commercial Mechanical Inspection 56 Workbook Page 47

57 Task 2: Inspect Factory Built Fireplaces IMC Section 903 Check fireplace and chimney installation. IMC Section and IFGC Section Check hearth extensions. IMC Section Check appliance installed in fireplaces (unvented gas log). IMC Section and UL IMC Performing Commercial Mechanical Inspection 57 Workbook Page 47-48

58 Typical Factory-build Fireplace With Hearth 2012 IMC Performing Commercial Mechanical Inspection 58 Workbook Page 47

59 Task 3: Inspect Fireplace Stoves and Room Heaters, Pellet Fuel Appliances and Barbecue appliances IMC Section Check installation. IMC Section 3905/IFGC Section Check for pellet fuel burning appliances vent connection. IMC Section Check barbecue appliances for compliance with IMC Section 906 and IFGC Section IMC Performing Commercial Mechanical Inspection 59 Workbook Page 48-49

60 Module 4 Performing Inspections of Piping Systems 2012 IMC Performing Commercial Mechanical Inspection 60

61 Four Parts Performing inspections of hydronic piping IMC Chapter 12 Performing inspections of refrigerant piping IMC Chapter 11 Performing inspections of condensate piping IMC Section 307/IFGC Section 307 Performing inspections of fuel piping and storage systems IMC Chapter IMC Performing Commercial Mechanical Inspection 61 Workbook Page 51

62 Performing Inspections of Hydronic Piping IMC Chapter 12 Three tasks: Inspect piping materials. IMC Section 1202 Inspect piping installation. IMC Section 1204 Inspect transfer fluid. IMC Section IMC Performing Commercial Mechanical Inspection 62 Workbook Page 51

63 Performing Inspections of Refrigerant Piping IMC Chapter 11 Three tasks: 1. Inspect piping materials. IMC Section Inspect joints. IMC Section Inspect stop valves. IMC Section IMC Performing Commercial Mechanical Inspection 63 Workbook Page 57

64 Performing Inspections of Condensate Piping IMC Section 307/IFGC Section 307 Three tasks: Inspect fuel-burning appliances. IMC Section 307.1/IFGC Section Inspect drain pipe materials and sizes. IMC Section and Table /IFGC Section Inspect evaporators and cooling coils. IMC Section 307.2/IFGC Section IMC Performing Commercial Mechanical Inspection 64 Workbook Page 61

65 Task 1: Inspect Fuel Burning Appliance Drain 1. Check collection and discharge. IMC Section 307.1/IFGC Section Check horizontal slope. IMC Section 307.1/IFGC Section Check for corrosion resistance. IMC Section 307.1/IFGC Section Check drain size. IMC Section and Table /IFGC Section IMC Performing Commercial Mechanical Inspection 65 Workbook Page 62

66 Task 2: Inspect Drain Pipe Materials and Sizes 1. Check component materials. IMC Section /IFGC Section Check material selection. IMC Section /IFGC Section Check condensate waste and drain line size. IMC Section and Table /IFGC Section IMC Performing Commercial Mechanical Inspection 66 Workbook Page 63

67 Task 3: Inspect Evaporators and Cooling Coils 1. Check condensate disposal point. IMC Section Check auxiliary and secondary drain systems. IMC Section /IFGC Section Check traps. IMC Section /IFGC Section IMC Performing Commercial Mechanical Inspection 67 Workbook Page 64

68 Performing Inspections of Fuel Piping and Storage Systems IMC Chapter 13 Three tasks: 1. Inspect fuel oil piping. IMC Table and Inspect fuel gas piping (IFGC Chapter 4). 3. Inspect hydrogen piping. IMC Table and IFGC Section 704, IMC Performing Commercial Mechanical Inspection 68 Workbook Page 65

69 Task 1: Inspect Fuel Oil Piping 1. Check for IFC compliance. IMC Section Check materials. IMC Section Check joints and connections. IMC Section Check fuel oil system installation. IMC Section 1305 and Check fill piping. IMC Section Check vent piping. IMC Section IMC Performing Commercial Mechanical Inspection 69 Workbook Page 66-68

70 Task 2: Inspect Fuel Gas Piping IFGC Chapter 4 1. Identify piping and components owned by the gas utility company. 2. Check materials and components. 3. Check installation. 4. Check sizing of gas piping. 5. Check gas flow controls. 6. Check appliance connections IMC Performing Commercial Mechanical Inspection 70 Workbook Page 69-72

71 Task 3: Inspect Hydrogen Piping IFGC Section Check piping. IFGC Section Check use. IFGC Section Verify tests. IFGC Section Check location. IFGC Section Check for IFC compliance. IFGC Section IMC Performing Commercial Mechanical Inspection 71 Workbook Page 73-74

72 Module 5 Performing Ventilation Inspections 2012 IMC Performing Commercial Mechanical Inspection 72

73 Four Tasks 1. Inspect exit enclosure ventilation. IMC Section (IMC has NEW content) 2. Inspect openings. IMC Section Inspect natural ventilation. IMC Section Inspect mechanical ventilation. IMC Section IMC Performing Commercial Mechanical Inspection 73 Workbook Page 75

74 Task 1: Inspect Exit Enclosure Ventilation 1. Check intake openings. IMC Section Check exhaust openings. IMC Section Check opening protection. IMC Section Check contaminant sources. IMC Section IMC Performing Commercial Mechanical Inspection 74 Workbook Page 77-78

75 Air Intake Opening Locations For SI: 1 inch = 25.4 mm, 1 foot = mm 2012 IMC Performing Commercial Mechanical Inspection 75 Workbook Page 77-78

76 Task 2: Inspect Openings 1. Check intake openings (IMC Section Ventilation). 2. Check exhaust openings (IMC Section Exhaust). 3. Check opening protection (IMC Table 401.5). 4. Check contaminant sources (IMC Section 401.6) IMC Performing Commercial Mechanical Inspection 76 Workbook Page 79-80

77 Economizer 2012 IMC Performing Commercial Mechanical Inspection 77

78 Task 3: Inspect Natural Ventilation 1. Check for natural ventilation openings. IMC Section Check ventilation area required. IMC Section Check adjoining spaces. IMC Section Check openings below grade (if present). IMC Section IMC Performing Commercial Mechanical Inspection 78 Workbook Page 81

79 Task 4: Inspect Mechanical Ventilation 1. Check the ventilation means. IMC Section Determine the ventilation rate. IMC Table Check the ventilation rate. IMC Table Check the recirculation of air. IMC Section Check transfer air, if being utilized. IMC Section Check common ventilation systems. IMC Section IMC Performing Commercial Mechanical Inspection 79 Workbook Page 82-96

80 Table Required Outdoor Ventilation Air 2012 IMC Performing Commercial Mechanical Inspection 80

81 Table Required Outdoor Ventilation Air 2012 IMC Performing Commercial Mechanical Inspection 81

82 Table Required Outdoor Ventilation Air 2012 IMC Performing Commercial Mechanical Inspection 82

83 Example 1: Single-zone Recirculating System A 3,000-square-foot dining room is served by a rooftop air-handling unit by means of ducted ceiling supply registers and ceiling return grilles. Determine the system outdoor air intake flow rate (V ot ) for the dining room IMC Performing Commercial Mechanical Inspection 83 Workbook Page 87-96

84 Application Example 1: Single-zone Recirculating System This dining room with a single rooftop unit is considered to be a single-zone system. In order to determine the outdoor air intake flow rate (V ot ) for a single-zone system using Equation 4-3, the breathing zone airflow rate (V bz ) of the occupied space must first be determined using Equation 4-1. Then, the zone airflow effectiveness (E z ) must be determined in accordance with Table Next, the zone outdoor airflow rate (V oz ) must be determined using Equation 4-2. The outdoor air intake flow rate for a single-zone system is then simply V ot = V oz, Equation IMC Performing Commercial Mechanical Inspection 84 Workbook Page 87-96

85 Example 1: Single-zone Recirculating System Step 1: Determine occupant load (P z ) for the room for use in Equation 4-1: V bz = R p P z + R a A z From Table for dining rooms, the occupant density of 70 occupants/1,000 ft 2 is used: 3,000 ft ,000 ft 2 = 210 occupants = P z 2012 IMC Performing Commercial Mechanical Inspection 85 Workbook Page 87-96

86 Example 1: Single-zone Recirculating System Step 2: Determine the breathing zone outdoor airflow (V bz ) for the room: First, the outdoor air rates for people (R p ) and area (R a ) must be obtained for the dining room from Table 403.3: R p = 7.5 cfm/person and R a = 0.18 cfm/ft 2 Equation 4-1 can now be solved: V bz = R p P z + R a A z V bz = (7.5 cfm/person 210 people) + (0.18 cfm/ft 2 3,000 ft 2 ) V bz = 2,115 cfm 2012 IMC Performing Commercial Mechanical Inspection 86 Workbook Page 87-96

87 Example 1: Single-zone Recirculating System Step 3: Determine the zone outdoor airflow (V oz ): It is given that the room is served by a rooftop air handling unit by means of ducted ceiling supply registers and ceiling return grilles. Thus, the zone air distribution effectiveness (E z ) can be obtained from Table In cooling mode, E z = 1.0, and in heating mode, Ez = 0.8. The most restrictive value, E z = 0.8, must be used (assume that Note g of Table does not apply) IMC Performing Commercial Mechanical Inspection 87 Workbook Page 87-96

88 Example 1: Single-zone Recirculating System Step 3: Determine the zone outdoor airflow (V oz ): Equation 4-2 can now be solved for the room: V oz = V bz E z Cooling Mode: V oz = 2, = 2,115 cfm Heating Mode: V oz = 2, = 2,644 cfm 2012 IMC Performing Commercial Mechanical Inspection 88 Workbook Page 87-96

89 Example 1: Single-zone Recirculating System Step 3: Determine the zone outdoor airflow (V oz ): As a result, the greater system demand for the dining room requires 2,644 cfm of outdoor air in heating mode. This value of V oz should be used to determine the maximum system requirement for outdoor air intake flow rate (V ot ), Equation 4-3: V ot = V oz = 2,644 cfm In comparison, the amount of outdoor air required using the 2006 code would be based on the same occupant load. However, the outdoor air ratio is 20 cfm per person. Therefore, the amount of outdoor air is 210 occupants 20 cfm/occupant = 4,200 cfm of outdoor air required IMC Performing Commercial Mechanical Inspection 89 Workbook Page 87-96

90 Example 2: Multiple-zone Recirculating Systems A single-story 8,000-square-foot office building consists of 7,250 square feet of general office space and a 500-square-foot conference room. The building is served by a rooftop unit by means of ducted ceiling supply registers and ceiling return grilles. The primary airflow provided by the rooftop unit is 8,100 cfm for the office space and 780 cfm for the conference room. Determine the outdoor air intake flow rate for the system serving the office area and conference room IMC Performing Commercial Mechanical Inspection 90 Workbook Page 87-96

91 Application Example 2: Multiple-zone Recirculating Systems This office area and conference room constitutes two separate zones that are served by a single rooftop unit. In order to determine the outdoor air intake flow rate (V ot ) for a multiple-zone system using Equation 4-8, the breathing zone airflow rate (V bz ) of the occupied space must first be determined using Equation 4-1. Then, the zone airflow effectiveness (E z ) must be determined in accordance with Table Next, the zone outdoor airflow rate (V oz ) must be determined using Equation IMC Performing Commercial Mechanical Inspection 91 Workbook Page 87-96

92 Application Example 2: Multiple-zone Recirculating Systems After determining the previously listed variables, the outdoor air intake flow rate for amultiple-zone recirculating system must be determined using Sections through The primary outdoor air fraction (Z p ) must be determined using Equation 4-5. Then the system ventilation efficiency (E v ) is determined in accordance with Table and the uncorrected outdoor air intake flow rate (V ou ) is determined using Equations 4-6 and IMC Performing Commercial Mechanical Inspection 92 Workbook Page 87-96

93 Example 2: Multiple-zone Recirculating Systems Step 1: Determine occupant loads (Pz) for each zone: For the general office space (Zone 1), the occupant density of 5 occupants/1,000 ft 2 is used (from Table for office spaces). P z (Zone 1) = 7,250 ft 2 5 occupants/1,000 ft 2 = 37 For the conference room (Zone 2), the occupant density of 50 occupants/1,000 ft 2 is used. P z (Zone 2) = 500 ft 2 50 occupants/1000 ft2 = IMC Performing Commercial Mechanical Inspection 93 Workbook Page 87-96

94 Example 2: Multiple-zone Recirculating Systems Step 2: Determine the breathing zone outdoor airflow (V bz ) for each zone: First, the outdoor air rates for people (R p ) and area (R a ) must be obtained for each zone from Table 403.3: Zone 1 values: R p (Zone 1) = 5 cfm/person and R a (Zone 1) = 0.06 cfm/ ft 2 Zone 2 values: R p (Zone 2) = 5 cfm/person and R a (Zone 2) = 0.06 cfm/ ft IMC Performing Commercial Mechanical Inspection 94 Workbook Page 87-96

95 Example 2: Multiple-zone Recirculating Systems Step 2: Determine the breathing zone outdoor airflow (V bz ) for each zone: Equation 4-1 can now be solved for each zone: V bz = R p P z + R a A z Zone 1: V bz = (5 cfm/person 37 people) + (0.06 cfm/ft 2 7,250 ft 2 ) V bz = 620 cfm Zone 2: V b z = (5 cfm/person x 25 people) + (0.06 cfm/ft ft 2 ) V bz = 155 cfm 2012 IMC Performing Commercial Mechanical Inspection 95 Workbook Page 87-96

96 Example 2: Multiple-zone Recirculating Systems Step 3: Determine the zone outdoor airflow (Voz) for each zone: It is given that the room is served by a rooftop air-handling unit by means of ducted ceiling supply registers and ceiling return grilles. Thus, the zone air distribution effectiveness (E z ) can be obtained from Table In cooling mode, E z = 1.0, and in heating mode, E z = 0.8 (assume that Note g of Table does not apply) IMC Performing Commercial Mechanical Inspection 96 Workbook Page 87-96

97 Example 2: Multiple-zone Recirculating Systems Equation 4-2 can now be solved for each zone: V oz = V bz /E z E z Zone 1: Cooling Mode: V oz = 620 cfm 1.0 = 620 cfm Heating Mode: V oz = 620 cfm 0.8 = 775 cfm Zone 2: Cooling Mode: V oz = 155 cfm 1.0 = 155 cfm Heating Mode: V oz = 155 cfm 0.8 = 194 cfm 2012 IMC Performing Commercial Mechanical Inspection 97 Workbook Page 87-96

98 Example 2: Multiple-zone Recirculating Systems Step 4: Determine the primary outdoor air fraction (Z p ) for each zone: The primary airflow (V pz ) is given: V pz (Zone 1) = 8,100 cfm and V pz (Zone 2) = 780 cfm. Equation 4-5 can now be solved for each zone: Z p =V oz V pz Zone 1: Z p = 775 cfm/8,100 cfm = Zone 2: Z p = 194 cfm/780 cfm = IMC Performing Commercial Mechanical Inspection 98 Workbook Page 87-96

99 Example 2: Multiple-zone Recirculating Systems Step 5: Determine the system ventilation efficiency (Ev): The largest value of Z p among all zones served by the system must be used. Therefore, for Z p = 0.25, Table yields E v = IMC Performing Commercial Mechanical Inspection 99 Workbook Page 87-96

100 Example 2: Multiple-zone Recirculating Systems Step 6: Determine the uncorrected outdoor air intake flow rate (V ou ): Note that the occupant diversity (D) calculation is optional, meaning that if no diversity is desired to be applied or if there is insufficient information for applying Equation 4-7, the designer can simply set D equal to 1 in Equation 4-6. The occupant diversity is used to account for occupants who will be either in one zone or the other at any given time. For this example, it is assumed that D is equal to 1 so as to make the results of Section more obvious, thereby making the example more meaningful. If, however, an occupant diversity (D) was applied in this example it would be calculated as follows: 2012 IMC Performing Commercial Mechanical Inspection 100 Workbook Page 87-96

101 Example 2: Multiple-zone Recirculating Systems The design assumption is that the conference room (Zone 2) may at times be occupied by outside visitors to conduct a presentation or meet with the staff with the balance of the conference room occupancy consisting of staff. An assumption is made that, on average, 80 percent of the conference room zone occupancy will be comprised of staff that normally occupies the Zone 1 office area IMC Performing Commercial Mechanical Inspection 101 Workbook Page 87-96

102 Example 2: Multiple-zone Recirculating Systems This results in a system population (Ps) as follows: P s = system population = Zone 1 population + Zone 2 visitors P s = 37 people + (25 people 0.2 visitor rate) = 42 occupants which are expected to be concurrently in all zones served by the system. The denominator of Equation 4-7 is simply the sum of the occupant loads of all zones, that being the sum of Zone 1, 37 occupants and Zone 2, 25 occupants. Equation 4-7 can now be solved for D, occupant diversity: D = D = 42 occupants/(37 occupants + 25 occupants) = 42/62 = IMC Performing Commercial Mechanical Inspection 102 Workbook Page 87-96

103 Example 2: Multiple-zone Recirculating Systems As stated earlier, D = 1 will be used in the remainder of this example. Equation 4-6 is solved as follows: V ou = D Σ all zones R p P z + Σ all zones R a A z V ou = D {[R p (Zone 1) x P z (Zone 1)] + [R p (Zone 2) x P z (Zone 2)]} + {[(R a (Zone 1) Az (Zone 1)] + [R a (Zone 2) A z (Zone 2)]} V ou = 1[(5 cfm/person 37 people) + (5 cfm/ person 25 people)] + [(0.06 cfm/ft 2 7,250 ft 2 ) + (0.06 cfm/ft ft 2 )] V ou = = 775 cfm 2012 IMC Performing Commercial Mechanical Inspection 103 Workbook Page 87-96

104 Example 2: Multiple-zone Recirculating Systems Step 7: Determine the outdoor air intake flow rate (Vot): Equation 4-8 gives the adjusted overall outdoor air flow rate required for the system, using the most restrictive value for system ventilation efficiency (Step 5), E v : V ot = V ou E v V ot = 775 cfm/0.9 = 861 cfm 2012 IMC Performing Commercial Mechanical Inspection 104 Workbook Page 87-96

105 Example 2: Multiple-zone Recirculating Systems This is the overall amount of outdoor air supplied by the rooftop unit to both zones. Now consider what the overall amount of outdoor air would have been if the Maximum Z p of 0.25 had been applied to both Zones 1 and 2 instead of working through the process of calculating the corrected outdoor air intake flow rate as performed in this example. For Zone 1, the outdoor/primary air fraction (Z p ) of 0.25 would require that 2,025 cfm be supplied to Zone 1 (2,025/8,100 = 0.25) IMC Performing Commercial Mechanical Inspection 105 Workbook Page 87-96

106 Example 2: Multiple-zone Recirculating Systems For Zone 2, the outdoor/primary air fraction (Z p ) of 0.25 would require the same as before, 194 cfm. (194/780 = 0.25). Adding both zones: 2, = 2,219 cfm. As can be seen, the process of Section has reduced (corrected) the outdoor rate by 1,358 cfm. If the occupant diversity factor (D) had been applied in this example, the true nature of the correction from Equation 4-8 would have been obscured. In comparison, the amount of outdoor air required using the 2006 code would be the following: 2012 IMC Performing Commercial Mechanical Inspection 106 Workbook Page 87-96

107 Zone 1: Example 2: Multiple-zone Recirculating Systems 7,250 ft 2 7 occupants 1,000 ft 2 = 51 occupants 20 cfm/occupant = 1,020 cfm OA Zone 2: 500 ft 2 50 occupants 1,000 ft 2 = 25 occupants 20 cfm/occupant = 500 cfm OA Total amount of outdoor air supplied by the rooftop unit is 1,520 cfm under the 2006 code IMC Performing Commercial Mechanical Inspection 107 Workbook Page 87-96

108 Example 3: Multiple-zone Recirculating Systems A wing of a new high school consists of a 2,200-square-foot art classroom, a 1,400- square-foot science lab, a 1,200-squarefoot computer lab and a 750-square-foot corridor. The entire wing is to be served by a single central air-handling unit in an adjoining mechanical room, via ceiling supply and ceiling return grilles and registers IMC Performing Commercial Mechanical Inspection 108 Workbook Page 87-96

109 Example 3: Multiple-zone Recirculating Systems The primary airflow provided for the building consists of 2,800 cfm for the art classroom, 2,400 cfm for the science lab, 1,800 cfm for the computer lab and 500 cfm for the corridor. Determine the outdoor air intake flow rate for the building area IMC Performing Commercial Mechanical Inspection 109 Workbook Page 87-96

110 Example 3: Multiple-zone Recirculating Systems Step 1: Determine occupant loads (P z ) for each zone: For the art classroom (Zone 1), Table under the Education occupancy, the occupant density is: P z (Zone 1) = (2,200 ft 2 /1,000 ft 2 ) 20 occupants P z (Zone 1) = 44 occupants For the science lab (Zone 2), the maximum occupancy is given as: P z (Zone 2) = (1,400 ft 2 /1,000 ft 2 ) 25 = 35 occupants) 2012 IMC Performing Commercial Mechanical Inspection 110 Workbook Page 87-96

111 Example 3: Multiple-zone Recirculating Systems For the computer lab (Zone 3), the maximum occupancy is: P z (Zone 3) = (1,200 ft 2 /1,000 ft 2 ) 25 occupants P z (Zone 3) = 30 occupants For the corridor (Zone 4), no specific occupancy criterion is given; therefore, from Table under the Education occupancy, the table says to go to Public Spaces for corridor requirements. The table entry for corridors does not have a value listed in the Occupant Density or People outdoor air rate columns; therefore, P z (Zone 4) = 0, and only requires the Area Outdoor Airflow Rate in Breathing Zone component to be considered, which will occur later in the example IMC Performing Commercial Mechanical Inspection 111 Workbook Page 87-96

112 Example 3: Multiple-zone Recirculating Systems Step 2: Determine the breathing zone outdoor airflow (V bz ) for each zone: First, the outdoor air rates for people (R p ) and area (R a ) must be obtained for each zone from Table 403.3: Zone 1 values R p (Zone 1) = 10 cfm/person; R a (Zone 1) = 0.18 cfm/ft 2 Zone 2 values: R p (Zone 2) = 10 cfm/person; R a (Zone 2) = 0.18 cfm/ft 2 Zone 3 values: R p (Zone 3) = 10 cfm/person; R a (Zone 3) = 0.12 cfm/ft 2 Zone 4 values: Rp (Zone 4) = 0 cfm/person; Ra (Zone 4) = 0.06 cfm/ft IMC Performing Commercial Mechanical Inspection 112 Workbook Page 87-96

113 Example 3: Multiple-zone Recirculating Systems Equation 4-1 can now be solved for each zone: V bz = R p (P z ) + R a (A z ) Zone 1: V bz (Zone 1) = 10 cfm/person (44 people) cfm/ft 2 (2,200 ft 2 ) V bz (Zone 1) = 836 cfm Zone 2: V bz (Zone 2) = 10 cfm/person (35 people) cfm/ft 2 (1,400 ft 2 ) V bz (Zone 2) = 602 cfm Zone 3: V bz (Zone 3) = 10 cfm/person (30 people) cfm/sq ft (1,200 ft 2 ) V bz (Zone 3) = 444 cfm Zone 4: V bz (Zone 4) = 0 cfm/person (0 people) cfm/sq ft (750 ft 2 ) V bz (Zone 4) = 45 cfm 2012 IMC Performing Commercial Mechanical Inspection 113 Workbook Page 87-96

114 Example 3: Multiple-zone Recirculating Systems Step 3: Determine the zone outdoor airflow (V oz ) for each zone: It is given that the building is served by a rooftop air- handling unit via ceiling supply and ceiling return. Thus, the zone air distribution effectiveness (E z ) can be obtained from Table ; in cooling mode, E z = 1.0, and in heating mode, E z = 0.8 (assume that Note g to the Table is not applicable in this example) IMC Performing Commercial Mechanical Inspection 114 Workbook Page 87-96

115 Example 3: Multiple-zone Recirculating Systems Equation 4-2 can now be solved for each zone: V oz = V bz /E z Zone 1: Cooling Mode V oz (Zone 1) = 836 cfm/1.0 = 836 cfm Heating Mode: V oz (Zone 1) = 836 cfm/0.8 = 1,045 cfm Zone 2: Cooling Mode: V oz (Zone 2) = 602 cfm/1.0 = 602 cfm Heating Mode: V oz (Zone 2) = 602 cfm/0.8 = 753 cfm Zone 3: Cooling Mode: Voz (Zone 3) = 444 cfm/1.0 = 444 cfm Heating Mode: V oz (Zone 3) = 444 cfm/0.8 = 555 cfm Zone 4: Cooling Mode: V oz (Zone 4) = 45 cfm/1.0 = 45 cfm Heating Mode: V oz (Zone 4) = 45 cfm/0.8 = 57 cfm 2012 IMC Performing Commercial Mechanical Inspection 115 Workbook Page 87-96

116 Example 3: Multiple-zone Recirculating Systems Step 4: Determine the primary outdoor air fraction (Z p ) for each zone: The primary airflow (V pz ) is given for each Zone: V pz (Zone 1) = 2,800 cfm; V pz (Zone 2) = 2,400 cfm; V pz (Zone 3) = 1,800 cfm; and V pz (Zone 4) = 500 cfm. The primary airflow (V pz ) is given for each Zone: V pz (Zone 1) = 2,800 cfm; V pz (Zone 2) = 2,400 cfm; V pz (Zone 3) = 1,800 cfm; and V pz (Zone 4) = 500 cfm. Z p = V oz /V pz 2012 IMC Performing Commercial Mechanical Inspection 116 Workbook Page 87-96

117 Example 3: Multiple-zone Recirculating Systems Step 4: Determine the primary outdoor air fraction (Z p ) for each zone: Zone 1: Z p (Zone 1) = 1,045 cfm/2,800 cfm = 0.37 Zone 2: Z p (Zone 2) = 753 cfm/2,400 cfm = 0.31 Zone 3: Z p (Zone 3) = 555 cfm/1,800 cfm = 0.31 Zone 4: Z p (Zone 4) = 57 cfm/500 cfm = IMC Performing Commercial Mechanical Inspection 117 Workbook Page 87-96

118 Example 3: Multiple-zone Recirculating Systems Step 5: Determine the system ventilation efficiency (E v ): The largest value of Z p among all zones served by the system must be used; thus, for Z p = 0.37 (largest value among all zones), Table yields a value of 0.7 for E v IMC Performing Commercial Mechanical Inspection 118 Workbook Page 87-96

119 Example 3: Multiple-zone Recirculating Systems Step 6: Determine the uncorrected outdoor air intake (V ou ): For occupant diversity (D), Equation 4-7 is used to account for occupants who will either be in one zone or the other at any given time IMC Performing Commercial Mechanical Inspection 119 Workbook Page 87-96

120 Example 3: Multiple-zone Recirculating Systems For this example, the school district has noted that the art classroom and computer lab will be normally occupied throughout the school day; however, the school district estimates that the science lab will be used only for two or three periods a day for combined classes and special events; thus, it is only occupied roughly 50 percent of the school day. However, since the science lab will draw its population from other areas of the campus, there is no assumed occupant diversity between the classrooms and labs within our analysis IMC Performing Commercial Mechanical Inspection 120 Workbook Page 87-96

121 Example 3: Multiple-zone Recirculating Systems Additionally, the corridor will be normally unoccupied, and will only have occupants between classes; as such, the corridor does not factor into the occupancy diversity calculation, but is considered only for area outdoor air rate. Since no one zone will draw occupants away from another zone, the occupant diversity value for our example is D = IMC Performing Commercial Mechanical Inspection 121 Workbook Page 87-96

122 Example 3: Multiple-zone Recirculating Systems Equation 4-6 can now be solved: V ou = D [Σ all zones (R p P z )] + [Σ all zones (R a A z )] V ou = D {[R p (Zone 1) P z (Zone 1)] + [R p (Zone 2) P z (Zone 2)] + [R p (Zone 3) P z (Zone 3)] + [R p (Zone 4) P z (Zone 4)]} + {[R a (Zone 1) A z (Zone 1)] + [R a (Zone 2) A z (Zone 2)] + [R a (Zone 3) A z (Zone 3)] + [R a (Zone 4) A z (Zone 4)]} V ou = 1.0 [(10 cfm/person 44 people) + (10 cfm/person 35 people) + (10 cfm/person 30 people) + (0 cfm/person 0 people)] + [(0.18 cfm/ft 2 2,200 ft 2 ) + (0.18 cfm/ft 2 1,400 ft 2 ) + (0.12 cfm/ft 2 1,200 ft 2 ) + (0.06 cfm/ft ft 2 )] V ou = [1,090] + [837] V ou = 1,927 cfm 2012 IMC Performing Commercial Mechanical Inspection 122 Workbook Page 87-96

123 Example 3: Multiple-zone Recirculating Systems Step 7: Determine the outdoor air intake flow rate (V ot ): Equation 4-8 gives the adjusted overall outdoor air flow rate required for the system, using the most restrictive value for system ventilation efficiency, E v : V ot = V ou /E v Vot = 1,927 cfm/0.7 = 2,753 cfm Compare with the 2006 code Table method: Art Classroom = (2,200 ft 2 /1,000 ft 2 ) 50 occupants = 110 occupants ( cfm/occupant = 1,650 cfm) Science Lab = (1,400 ft 2 /1,000 ft 2 ) 30 occupants = 42 occupants (42 20 cfm/occupant = 840 cfm) Computer Lab = (1,200 ft 2 /1,000 ft 2 ) 50 occupants = 60 occupants (60 15 cfm/occupant = 900 cfm) 2012 IMC Performing Commercial Mechanical Inspection 123 Workbook Page 87-96

124 Example 3: Multiple-zone Recirculating Systems Step 7: Determine the outdoor air intake flow rate (V ot ): Equation 4-8 gives the adjusted overall outdoor air flow rate required for the system, using the most restrictive value for system ventilation efficiency, E v : Corridor = (750 ft cfm/ft 2 = 38 cfm) In the 2006 edition of the code, (1, ) = 3,428 cfm would have been required. Note that the science lab and computer lab both require an exhaust system in accordance with Table 403.3, and such system is in addition to the ventilation calculated in this example (see Section 403.4) IMC Performing Commercial Mechanical Inspection 124 Workbook Page 87-96

125 Energy Recovery Ventilation Systems Section General. Ducted heat recovery ventilators shall be listed and labeled in accordance with UL Nonducted heat recovery ventilators shall be listed and labeled in accordance with UL Recirculated air. Air conveyed within energy recovery systems shall not be considered as recirculated air where the energy recovery ventilation system is constructed to limit cross-leakage between air streams to less than 10 percent of the total airflow design capacity IMC Performing Commercial Mechanical Inspection 125 Workbook Page 87-96

126 An Energy-conserving Alternative to Natural Ventilation 2012 IMC Performing Commercial Mechanical Inspection 126 Workbook Page 84-89

127 Module 6 Performing Inspections of Combustion Air provisions (Gas) and NonGas Fuel Installation 2012 IMC Performing Commercial Mechanical Inspection 127

128 Five Parts Performing inspections of indoor air (gas). IFGC Section Performing inspections of outdoor air provisions. IFGC Section Performing inspection of combination indoor/outdoor air. IFGC Section Performing inspections of engineered systems and combustion air supply. IFGC Section IMC Performing Commercial Mechanical Inspection 128 Workbook Page 97

129 Five Parts (cont.) Performing inspection of mechanical combustion air supply. Mechanical Combustion Air Supply. IFGC Section IMC Performing Commercial Mechanical Inspection 129 Workbook Page 97

130 Task 1: Inspect Indoor Air 1. Determine the required indoor volume. IFGC Section and Check indoor opening size and location. IFGC Section IMC Performing Commercial Mechanical Inspection 130 Workbook Page 99-

131 All Air from Inside the Building 2012 IMC Performing Commercial Mechanical Inspection 131 Workbook Page

132 Performing Inspections for Outdoor Air (Gas) Provisions Three tasks: 1. Inspect air opening dimensions. IFGC Section Inspect two-permanent-opening method. IFGC Section Inspect one-permanent-opening method. IFGC Section IMC Performing Commercial Mechanical Inspection 132 Workbook Page 101

133 Task 1: Inspect Air Opening Dimensions Check minimum dimension of any air opening. IFGC Section , and IMC Performing Commercial Mechanical Inspection 133 Workbook Page 102

134 Task 2: Inspect Two-Permanent- Opening Method Check opening location. IFGC Section Check communication to the outdoors. IFGC Section IMC Performing Commercial Mechanical Inspection 134 Workbook Page 102

135 Inlet Air from Ventilated Crawl Space and Outlet Air to Ventilated Attic 2012 IMC Performing Commercial Mechanical Inspection 135 Workbook Page 102

136 Inlet Air from Inlet Duct and Outlet Air to Ventilated Attic For SI: 1 inch = 25.4 mm, 1 foot = mm 2012 IMC Performing Commercial Mechanical Inspection 136 Workbook Page 102

137 All Air from Outdoors 2012 IMC Performing Commercial Mechanical Inspection 137 Workbook Page 102

138 Task 3: Inspect One-Permanent- Opening Method 1. Check opening location. IFGC Section Combination Indoor and Outdoor Combustion air. IFGC Check communication to the outdoors. IFGC Section Check clearances. IFGC Section IMC Performing Commercial Mechanical Inspection 138 Workbook Page 103

139 One-Permanent-Opening Method, All Air from the Outdoors 2012 IMC Performing Commercial Mechanical Inspection 139 Workbook Page 103

140 Performing Inspections of Combination Indoor/Outdoor Air Three tasks: 1. Inspect indoor openings. IFGC Section Inspect outdoor opening location. IFGC Section Inspect outdoor opening(s) size. IFGC Section IMC Performing Commercial Mechanical Inspection 140 Workbook Page 104

141 Task 1: Inspect Indoor Openings 1. Check for the minimum free area. IFGC Section Check opening locations. IFGC Section IMC Performing Commercial Mechanical Inspection 141 Workbook Page 104

142 Task 2: Inspect Outdoor Opening Location Check opening locations. IFGC Section and IMC Performing Commercial Mechanical Inspection 142 Workbook Page 105

143 Task 3: Inspect Outdoor Opening(s) Size Check outdoor opening sizes. IFGC Section 304.6, and IMC Performing Commercial Mechanical Inspection 143 Workbook Page 105

144 Performing Inspections of Engineered Systems and Mechanical Combustion Air Supply Two tasks: 1. Inspect engineered systems. IFGC Section Inspect mechanical combustion air supply. IFGC Section IMC Performing Commercial Mechanical Inspection 144 Workbook Page 106

145 Task 1: Inspect Engineered Systems Verify that engineered systems meet the intent of the code. IFGC Section IMC Performing Commercial Mechanical Inspection 145 Workbook Page 106

146 Task 2: Inspect Mechanical Combustion Air Supply 1. Check outdoor air supply rate. IFGC section Check makeup air. IFGVC Section Check appliance interlock. IFGC Section Check combined combustion air and ventilation air system. IFGC Section IMC Performing Commercial Mechanical Inspection 146 Workbook Page 107

147 Mechanical Combustion Air Supply System IFGC IMC Performing Commercial Mechanical Inspection 147 Workbook Page 107

148 Mechanical Combustion Makeup Air Supply System IFGC IMC Performing Commercial Mechanical Inspection 148 Workbook Page 107

149 Mechanical Combustion Makeup Air Supply System IFGC IMC Performing Commercial Mechanical Inspection 149 Workbook Page 107

150 Module 7 Performing Venting Systems Inspections 2012 IMC Performing Commercial Mechanical Inspection 150

151 Venting Systems Inspection Tasks Inspect for general compliance. IFGC Section and Inspect vents. IFGC Section 502 and Inspect chimneys. IFGC Section , , Inspect connectors. IFGC Section and Inspect appliance venting. IFGC Section IMC Performing Commercial Mechanical Inspection 151 Workbook Page 109

152 Task 1: Inspect for General Requirements Compliance Only 1 step IFGC Section 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 IMC Performing Commercial Mechanical Inspection 152 Workbook Page 111

153 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 2012 IMC Performing Commercial Mechanical Inspection 153 Workbook Page 111

154 Task 2: Inspect Vents 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 IMC Performing Commercial Mechanical Inspection 154 Workbook Page 112

155 Task 3: Inspect Chimneys 1. Check masonry chimneys. IFGC Section Check for common chimneys or flue-ways. IFGC Section Check gas-fired appliances. IFGC Section Check for decorative shrouds. IFGC Section Check existing chimneys and vents. IFGC Section Check sizing of venting systems. IFGC Section IMC Performing Commercial Mechanical Inspection 155 Workbook Page

156 Decorative Shrouds Gas Vents IFGC , Chimney IFGC IMC Performing Commercial Mechanical Inspection 156 Workbook Page

157 Existing Chimneys and Vents IFGC OUTSIDE WALL REPLACEMENT BOILER- CATEGORY III VENTED THROUGH WALL EXISTING MASONRY CHIMNEY EXISTING WATER HEATER CLEAN-OUT REMOVED APPLIANCE, PREVIOUS CHIMNEY- CONNECTED BOILER 2012 IMC Performing Commercial Mechanical Inspection 157 Workbook Page

158 Vent System Performance Factors 2012 IMC Performing Commercial Mechanical Inspection 158 Workbook Page

159 Task 4: Inspect Connectors 1. Check for potential condensate production. IFGC Section and Check connector location. IFGC Section through Check combined connectors. IFGC Section Check offsets. IFGC Section , and Check connector length limit. IFGC Section and IMC Performing Commercial Mechanical Inspection 159 Workbook Page

160 Connectors 2012 IMC Performing Commercial Mechanical Inspection 160 Workbook Page

161 Walking though the Steps: Connector Length Limit A 3" diameter 2.5' B 4" diameter FAN OR DRAFT HOOD APPLIANCE 2' DRAFT HOOD 1' 4.5' DRAFT HOOD 9.5' C 6" diameter For SI: 1 inch = 25.4 mm, 1 foot = mm 2012 IMC Performing Commercial Mechanical Inspection 161 Workbook Page 122

162 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 = IMC Performing Commercial Mechanical Inspection 162 Workbook Page 123

163 Task 4: Inspect Connectors 6. Check for length alternative. IFGC Section or Check for common vent offsets. IFGC Section or Check for vent capacity reduction (elbows). IFGC Section Check for connector capacity reduction. IFGC Section Check seven times rule. IFGC Section IMC Performing Commercial Mechanical Inspection 163 Workbook Page

164 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 IMC Performing Commercial Mechanical Inspection 164 Workbook Page 123

165 3' RISE Walking Though the Steps: Length Alternative C L DOUBLE-WALL CONNECTOR FROM 2nd CATEGORY I APPLIANCE 5-INCH DIAMETER DOUBLE-WALL CONNECTOR 20 ft TOTAL VENT HEIGHT HOT WATER BOILER FAN-ASSISTED 82% EFFICIENT 135,000 Btu/h 2012 IMC Performing Commercial Mechanical Inspection 165 Workbook Page 124

166 Length Connector A. Determine maximum allowable vent connector length Use Table inch (127 mm) connector diameter is 7 ½ feet (2286 mm) IMC Performing Commercial Mechanical Inspection 166 Workbook Page 124

167 Length Connector B. Determine absolute maximum allowable vent connector length Use Section inch (127 mm) connector diameter 20 feet (6096 mm) [High Vent] IMC Performing Commercial Mechanical Inspection 167 Workbook Page 125

168 Length Connector C. Evaluate steps 1 and 2 Apply the more restrictive criteria, or Apply connector length alternative provisions of Section IMC Performing Commercial Mechanical Inspection 168 Workbook Page 125

169 Length Connector D. Apply provisions of Section Use Tables 504.3(2) and 504.3(1) (A/B C) + D Extend vent connector maximum length to 15 feet (4572 mm) (2.5/5 30) = Apply 10 percent capacity reduction 1/2 30) = Maximum input capacity of 176,000 Btu/h ( W) = 210 [176,000 x.90] = 158,400 Btu/h ( W) 158,400 Btu > 135,000 Btu/h ( W > W) Boiler exceeds minimum required input of 59,000 Btu/h ( W) in Table 504.2(1) 2012 IMC Performing Commercial Mechanical Inspection 169 Workbook Page 125

170 Offsets 2012 IMC Performing Commercial Mechanical Inspection 170 Workbook Page 128

171 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. IFGC Section IMC Performing Commercial Mechanical Inspection 171 Workbook Page 129

172 Task 5: Inspect Appliance Venting 1. Check sizing of category I appliance venting systems. IFGC Section Check sizing of venting systems for a single appliance. IFGC Section Check minimum size. IFGC Section (1-5). 4. Check vent offsets. IFGC IMC Performing Commercial Mechanical Inspection 172 Workbook Page

173 Task 5: Inspect Appliance Venting 5. Check multiple input rate appliances. IFGC Check chimney and vent locations. IFGC Check liner system sizing. IFGC Check vent area and diameter. IFGC Section IMC Performing Commercial Mechanical Inspection 173 Workbook Page

174 Task 5: Inspect Appliance Venting 9. Check table interpolation. IFGC Table (1) and (2). 10.Check sizing of a venting system for two of more appliances. IFGC Table (1) through (7). 11.Check height and rise measurement. IFGC Table (1) through (7). 12. Check vent fittings. IFGC Section IMC Performing Commercial Mechanical Inspection 174 Workbook Page

175 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 ( 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) 2012 IMC Performing Commercial Mechanical Inspection 175 Workbook Page 134

176 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)] IMC Performing Commercial Mechanical Inspection 176 Workbook Page 134

177 Table Interpolation IFGC Table 504.2(1) C. Determine the difference between the two maximum vent capacities. 330 D. Determine the (A/B maximum C) + D vent capacity for (2.5/5 30) a 121/2-foot-high (3810 mm) vent. (1/2 30) = IMC Performing Commercial Mechanical Inspection 177 Workbook Page 134

178 Sizing Type B Vent System 2012 IMC Performing Commercial Mechanical Inspection 178 Workbook Page 137

179 Sizing Type B Vent System A. Find each connector size: a. Select correct table: 504.3(1) Table number: b. Determine the least total height of vent and the rise for each connector. 15 feet (4572 mm) 1 foot (305 mm) 3 feet (914 mm) Vent height: Water heater rise: Furnace rise: c. Determine the vent connector size per the applicable table: 4 inch (102 mm) 5 inch (127 mm) Water heater: Furnace: 2012 IMC Performing Commercial Mechanical Inspection 179 Workbook Page 139

180 Sizing Type B Vent System B. Find common vent size: a. Determine the total Btu/h input: Combined input rating: 140,000 Btu/h (40,994 W) 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: 5 inch (127 mm) 2012 IMC Performing Commercial Mechanical Inspection 180 Workbook Page 139

181 Task 5: Inspect Appliance Venting 13.Check vent terminations. IFGC Section and Table Check multistory installations. IFGC Section Check direct-vent, integral vent, mechanical vent and ventilation/ exhaust hood venting. IFGC Section IMC Performing Commercial Mechanical Inspection 181 Workbook Page

182 Gas Vent Termination Determine which diagram shows correct vent termination requirement 5' Correct 45 Incorrect, 18 6' 12 [needs 7'6" (2286 mm)] 2012 IMC Performing Commercial Mechanical Inspection 182 Workbook Page 144

183 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 2012 IMC Performing Commercial Mechanical Inspection 183 Workbook Page 145

184 Venting Systems Work the problem here. A. 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 and IMC Performing Commercial Mechanical Inspection 184 Workbook Page 145

185 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 and the MAX Length allowed is 12.75' (3886 mm) [75% 17' (5182 mm) = (75% 5182 = 3886)] 2012 IMC Performing Commercial Mechanical Inspection 185 Workbook Page 145

186 Venting Systems Work the problem here. F. Maximum allowable length of common vent offset. 7.5 (191 mm) G. Is interpolation necessary? No 2012 IMC Performing Commercial Mechanical Inspection 186 Workbook Page 145

187 Sizing of Venting Systems for Two or More Appliances 2012 IMC Performing Commercial Mechanical Inspection 187 Workbook Page 148

188 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 2012 IMC Performing Commercial Mechanical Inspection 188 Workbook Page 148

189 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 fanassisted Category I furnace (FAN). Single-wall pipe connectors are used. Vent height is 35 feet ( 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) IMC Performing Commercial Mechanical Inspection 189 Workbook Page 141

190 Sizing of Venting Systems for Two or More Appliances A. Furnace Connector Material: Size: Type B 4 inches, [Table 504.3(1)] B. Water Heater Connector Material: Size: C. Common Vent Size: 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)] 2012 IMC Performing Commercial Mechanical Inspection 190 Workbook Page 149

191 Sizing of Venting Systems for Two or More Appliances D. Interpolation Necessary? No E. Any Noted Violations? 2012 IMC Performing Commercial Mechanical Inspection 191 Workbook Page 142

192 Common Vent Sizing For Two or More Appliances Workbook page 143 In groups of 3-4 Answer the A through M 2012 IMC Performing Commercial Mechanical Inspection 192 Workbook Page 150

193 Module 8 Performing Inspections of Exhaust Systems 2012 IMC Performing Commercial Mechanical Inspection 193

194 Six Tasks 1. Inspect for required systems compliance. IMC Section Inspect motors and fans. IMC Section Inspect clothes dryer exhaust. IMC Section 504 and IFGC Section Inspect commercial kitchen exhaust systems. IMC Section 506 through Inspect hazardous exhaust systems. IMC Section Inspect energy recovery ventilation systems. IMC Section IMC Performing Commercial Mechanical Inspection 194 Workbook Page 155

195 Task 1: Inspect for Required Systems Compliance 1. Check exhaust location. IMC Section and Check areas requiring exhaust systems. IMC Section Check for recirculation. IMC Table Check termination points. IMC Section IMC Performing Commercial Mechanical Inspection 195 Workbook Page

196 Task 2: Inspect Motors and Fans 1. Check sizes. IMC Section Check fan protection. IMC Section Check fans in areas with corrosives. IMC Section Check for required Fan Interlocks. IMC Section IMC Performing Commercial Mechanical Inspection 196 Workbook Page 159

197 Task 3: Inspect Clothes Dryer Exhaust 1. Check installation. IMC Section and IFGC Section Check exhaust penetrations. IMC Section and IFGC Section Check exhaust installation. IMC Section and IFGC IMC Performing Commercial Mechanical Inspection 197 Workbook Page

198 Multiple Dryer Installation 2012 IMC Performing Commercial Mechanical Inspection 198 Workbook Page

199 Task 4: Inspect Commercial Kitchen Exhaust Systems 1. Check for the presence of exhaust systems where required. IMC Section507.2, , and Check grease duct clearances. IMC Section Check grease duct enclosure. IMC Section through Check terminations through an exterior wall, if present. IMC Section IMC Performing Commercial Mechanical Inspection 199 Workbook Page

200 Termination Through Exterior Wall For SI: 1 inch = 25.4 mm, 1 foot = mm 2012 IMC Performing Commercial Mechanical Inspection 200 Workbook Page

201 Task 4: Inspect Commercial Kitchen Exhaust Systems 5. Check ducts. IMC Section through 506.3, , , and Check type I hoods. IMC Section Check type II hoods. IMC Section Check type I and II materials. IMC Section and IMC Performing Commercial Mechanical Inspection 201 Workbook Page

202 Task 4: Inspect Commercial Kitchen Exhaust Systems 9. Check capacity of the hoods. IMC Section Check fuel burning appliances. IMC Section Check commercial kitchen makeup air. IMC Section Verify or observe the capture and containment test. IMC Section IMC Performing Commercial Mechanical Inspection 202 Workbook Page

203 COMMERCIAL COOKING RECIRCULATING SYSTEM Self-contained system consisting of the exhaust hood, the cooking equipment, the filters and the fire suppression system. The system is designed to capture cooking vapors and residue generated from commercial cooking equipment. The system removes contaminants from the exhaust air an re-circulates the air to the space from which it was withdrawn IMC Performing Commercial Mechanical Inspection 203

204 COMMERCIAL COOKING APPLIANCES Appliances used in a commercial food service establishment for heating or cooking food and which produce grease vapors, steam, fumes, smoke or odors that are required to be removed through a local exhaust ventilation system For the purpose of this definition, a food service establishment shall include any building or a portion thereof used for the preparation and serving of food IMC Performing Commercial Mechanical Inspection 204

205 Backshelf Hood A backshelf hood is also referred to as a low-proximity hood, or as a sidewall hood where all mounted. It s front lower lip is low over the appliance(s) and is set back from the front of the appliance(s). It is always closed to the rear of the appliances by a panel where free-standing, or by a panel or wall where wall mounted and its height above the cooking surface varies. (This style of hood can be constructed with partial end panels to increase its effectiveness in capturing the effluent generated by the cooling operation) IMC Performing Commercial Mechanical Inspection 205

206 Backshelf Hood 2012 IMC Performing Commercial Mechanical Inspection 206

207 Double Island Canopy Hood A double island canopy hood is placed over back to back appliances or appliance lines. It is open on all sides and overhangs both fronts and the sides of the appliance(s). It could have a wall panel between the backs of the appliances. (The fact that exhaust air is drawn from both sides of the double canopy to meet in the center causes each side of this hood to emulate a wall canopy hood, and thus it functions much the same with or without an actual wall panel between the backs of the appliances) IMC Performing Commercial Mechanical Inspection 207

208 Eyebrow Hood A eyebrow hood is mounted directly to the face of an appliance, such as an oven and dishwasher, above the opening(s) or door(s) from which effluent is emitted, extending past the sides and overhanging the front of the opening to capture the effluent IMC Performing Commercial Mechanical Inspection 208

209 Pass-over Hood A passover hood is a free-standing form of a backshelf hood constructed low enough to pass food over the top IMC Performing Commercial Mechanical Inspection 209

210 Single Island Canopy Hood A single island copy hood is placed over a single appliance or appliance line. It is open on all sides and overhangs the front, rear, and sides of the appliance(s). A single island canopy is more susceptible to cross drafts and requires a greater exhaust air flow than an equivalent sized wallmounted canopy to capture and contain effluent generated by cooling operations(s) IMC Performing Commercial Mechanical Inspection 210 Workbook Page

211 Wall Canopy Hood A wall canopy exhaust hood is mounted against a wall above a single appliance or line of appliance(s), or it could be freestanding with a back panel from the rear of the appliances to the hood. It overhangs the front and sides of the appliance(s) on all open sides. The wall acts as a back panel, forcing the makeup air to be drawn across the front of the cooking equipment, thus increasing the effectiveness of the hood to capture and contain effluent generated by the cooking operation(s) IMC Performing Commercial Mechanical Inspection 211 Workbook Page

212 Canopy Hood - Elevation For SI: 1 inch = 25.4 mm, 1 foot = mm 2012 IMC Performing Commercial Mechanical Inspection 212 Workbook Page

213 Back-To-Back Type Canopy Hood For SI: 1 inch = 25.4 mm, 1 foot = mm 2012 IMC Performing Commercial Mechanical Inspection 213 Workbook Page

214 Extra-Heavy-Duty Cooking Appliance Extra heavy duty cooling appliances include appliances utilizing solid fuel such as wood, charcoal, briquettes and mesquite as the primary source of heat for cooking IMC Performing Commercial Mechanical Inspection 214

215 Heavy-Duty Cooling Appliance Heavy-duty cooling appliances include electric under-fired broilers, electric chain (conveyor) broilers, gas under-fired broilers, gas chain (conveyor) broilers, gas open-burner ranges (with or without oven), electric and gas wok ranges and electric ad gas over-fired (upright) broilers and salamanders IMC Performing Commercial Mechanical Inspection 215

216 Light-Duty Cooking Appliances Light-duty cooling appliances include gas and electric ovens (including standard, bake, roasting, revolving, re-therm, convection, combination convection/steamer, conveyor, deck or deck-style pizza, and pastry), electric and gas steam-jacketed kettles, electric and gas compartment steamers (both pressure and atmospheric) and electric and gas cheesemelters IMC Performing Commercial Mechanical Inspection 216

217 Medium-Duty Cooling Appliance Medium-duty cooling appliances include electric discrete element ranges (with or without oven), electric and gas hot top ranges, electric and gas griddles, electric and gas double sided griddles, electric and gas fryers (including open deep fat fryers, donut fryers, kettle fryers and pressure fryers), electric and gas pasta cookers, electric and gas conveyor pizza ovens, electric and gas tilting skillets (brasing pans) and electric and gas rotisseries IMC Performing Commercial Mechanical Inspection 217

218 Makeup Air Supplied to Hood 2012 IMC Performing Commercial Mechanical Inspection 218 Workbook Page

219 Task 5: Inspect Hazardous Exhaust System 1. Check for hazardous exhaust systems where required. IMC Section Check design. IMC Section Check operation. IMC Section IMC Performing Commercial Mechanical Inspection 219 Workbook Page 168

220 Task 6: Inspect Energy Recovery Ventilation Systems 1. Check IECC compliance, if necessary. IMC Section Check if installation is allowed. IMC Section IMC Performing Commercial Mechanical Inspection 220 Workbook Page 169

221 Module 9 Performing Inspections of Ducts and Plenums 2012 IMC Performing Commercial Mechanical Inspection 221

222 Six Tasks 1. Inspect egress elements. IMC Section Inspect plenums. IMC Section Inspect duct construction and installation. IMC Section Inspect insulation. IMC Section Inspect smoke detection systems control. IMC Section Inspect ducts and air transfer openings. IMC Section IMC Performing Commercial Mechanical Inspection 222 Workbook Page 171

223 Task 1: Inspect Egress Elements 1. Check air movement in egress elements. IMC Section Check the corridor ceiling. IMC Section Check the exit enclosure for compliance. IMC Section Check for the air movement in egress situations. IMC Section IMC Performing Commercial Mechanical Inspection 223 Workbook Page

224 Task 2: Inspect Plenums 1. Check locations of supply, return, exhaust, relief and ventilation air plenums. IMC Section Check plenum construction. IMC Section Check materials exposed within plenums. IMC Section Check stud cavity and joist space plenums. IMC Section Check for flood hazard. IMC Section IMC Performing Commercial Mechanical Inspection 224 Workbook Page

225 Typical Floor/Ceiling Return and Plenum 2012 IMC Performing Commercial Mechanical Inspection 225 Workbook Page

226 Mechanical Room Used as Return Air Plenum 2012 IMC Performing Commercial Mechanical Inspection 226 Workbook Page

227 Acceptable Stud and Joist Space Plenum Installation 2012 IMC Performing Commercial Mechanical Inspection 227 Workbook Page

228 Unacceptable Stud and Joist Space Plenum Installation 2012 IMC Performing Commercial Mechanical Inspection 228 Workbook Page

229 Task 3: Inspect Duct Construction and Installation 1. Check duct sizing. IMC Section Check duct classification. IMC Section Check metallic ducts. IMC Section Check nonmetallic ducts. IMC Section IMC Performing Commercial Mechanical Inspection 229 Workbook Page

230 Task 3: Inspect Duct Construction and Installation 5. Check flexible air ducts and flexible air connections. IMC Section Check underground ducts. IMC Section Check duct joints and supports. IMC Section and Check furnace connections. IMC Section IMC Performing Commercial Mechanical Inspection 230 Workbook Page

231 Flexible Connector IMC Section IMC Performing Commercial Mechanical Inspection 231 Workbook Page

232 Task 3: Inspect Duct Construction and Installation 9. Check condensation. IMC Section Check location. IMC Section Check for protection. IMC Section and Check registers, grilles and diffusers. IMC Section (NEW ) IMC Performing Commercial Mechanical Inspection 232 Workbook Page

233 Task 4: Inspect Insulation 1. Check for IECC compliance. IMC Section Check surface temperature. IMC Section Check coverings and linings. IMC Section Check foam plastic insulation. IMC Section IMC Performing Commercial Mechanical Inspection 233 Workbook Page

234 Duct Coverings IMC Section IMC Performing Commercial Mechanical Inspection 234 Workbook Page

235 Task 4: Inspect Insulation 5. Check appliance testing and labeling. IMC Section Check penetration of assemblies. IMC Section Check identification. IMC Section Check lining installation. IMC Section IMC Performing Commercial Mechanical Inspection 235 Workbook Page

236 Task 4: Inspect Insulation 9. Check for thermal continuity. IMC Section Check service openings. IMC Section Check vapor retarders. IMC Section Check weatherproof barriers. IMC Section Check internal insulation. IMC Section IMC Performing Commercial Mechanical Inspection 236 Workbook Page

237 Task 5: Inspect Smoke Detection Systems Control 1. Check that required controls are present. IMC Section Check location of controls. IMC Section Check installations. IMC Section Check controls operation. IMC Section IMC Performing Commercial Mechanical Inspection 237 Workbook Page

238 Duct Smoke Detectors 2012 IMC Performing Commercial Mechanical Inspection 238 Workbook Page

239 Return Riser 2012 IMC Performing Commercial Mechanical Inspection 239 Workbook Page

240 Task 6: Inspect Ducts and Air Transfer Openings 1. Check installation. IMC Section Verify damper testing and ratings. IMC Section and Check location requirements. IMC Section Check horizontal assemblies. IMC Section Check Membrane penetrations. IMC Section Check flexible ducts and air connectors. IMC Section IMC Performing Commercial Mechanical Inspection 240 Workbook Page

241 Module 10 Performing Refrigeration Inspections 2012 IMC Performing Commercial Mechanical Inspection 241

242 Three Tasks Inspect for general requirements compliance. IMC Section Inspect classification. IMC Section and Table Inspect machinery room. IMC Section IMC Performing Commercial Mechanical Inspection 242 Workbook Page 187

243 Task 1: Inspect for General Requirements Compliance 1. Check factory-built equipment and appliances. IMC Section Check for protection. IMC Section Check water connection. IMC Section Check fuel gas connection. IMC Section IMC Performing Commercial Mechanical Inspection 243 Workbook Page

244 Task 1: Inspect for General Requirements Compliance (cont) 5. Check for changes in refrigerant type. IMC Section Looking for access port caps. IMC Section (NEW). 7. Verify field test. IMC Section IMC Performing Commercial Mechanical Inspection 244 Workbook Page

245 Task 2: Determine Classification 1. Determine the refrigeration system s classification. IMC Section and Determine the refrigerant classification. IMC Section and Table Determine the maximum allowable quantity of refrigerant. IMC Table Determine the system enclosure requirements. IMC Section , and Check refrigeration equipment location and installation. IMC Section 1105 and IMC Performing Commercial Mechanical Inspection 245 Workbook Page

246 Low-Probability Systems IMC Section IMC Performing Commercial Mechanical Inspection 246 Workbook Page

247 High-Probability Systems IMC Section IMC Performing Commercial Mechanical Inspection 247 Workbook Page

248 Task 3: Inspect Machinery Room 1. Check refrigerant detector. IMC Section Check fuel-burning appliances. IMC Section Check rate for normal ventilation. IMC Section Check for compliance with special requirements. IMC Section Refrigerant piping. IMC Section IMC Performing Commercial Mechanical Inspection 248 Workbook Page

249 Module 11 Gas Piping Installations 2012 IMC Performing Commercial Mechanical Inspection 249

250 Five Tasks 1. Inspect for proper identification. IFGC Section Review gas piping system plan. 3. Inspect piping materials. IFGC Section Inspect piping system installation. IFGC Section Inspect gas flow controls. IFGC Section IMC Performing Commercial Mechanical Inspection 250 Workbook Page 199

251 Task 1: Inspect for Proper Identification 1. Check exposed gas piping. IFGC Section Check multiple meter installations. IFGC Section IMC Performing Commercial Mechanical Inspection 251 Workbook Page 200

252 Task 2: Review Gas Piping System Plan 1. Determine maximum gas demand. IFGC Section Determine length to most remote outlet. IFGC Section and Select the correct table. IFGC Table (1)-(35). 4. Locate gas-demand figures. IFGC Table (1)-(35). 5. Locate nominal size of pipe required. IFGC Table (1)-(35) IMC Performing Commercial Mechanical Inspection 252 Workbook Page

253 A Gas Piping System Plan 2012 IMC Performing Commercial Mechanical Inspection 253 Workbook Page

254 10 ft Section 5 Point of Delivery 20 ft Outlet D Outlet B Furnace 40-gal Water Heater 133,000 Btu/hr 45,000 Btu/hr 15 ft 15 ft Section 4 Section 3 5 ft 5 ft 12 ft Outlet C Range 73,000 Btu/hr Section 2 25 ft Outlet A Clothes Dryer 20,000 Btu/hr Section 1 15 ft Gas System Sizing Problem Outlet D Furnace 133,000 Btu/hr Outlet B 40-gal Water Heater 45,000 Btu/hr Outlet A Clothes Dryer 20,000 Btu/hr Section 5 20 ft 15 ft Section 4 Section 3 5 ft 5 ft 15 ft Section 2 25 ft Section 1 15 ft 10 ft 12 ft Point of Delivery Outlet C Range 73,000 Btu/hr For SI: 1 inch = 25.4 mm, 1 foot = mm 2012 IMC Performing Commercial Mechanical Inspection 254 Workbook Page 205

255 Gas System Sizing Problem 1. Determine maximum gas demand: Outlet A: 20 cfh (0.57m 3 /hr) Outlet B: 45 cfh (1.27m 3 /hr) Outlet C: 73 cfh (2.07m 3 /hr) Outlet D: 133 cfh (3.76m 3 /hr) Maximum gas demand: 271 cfh (7.86m 3 /hr) 2012 IMC Performing Commercial Mechanical Inspection 255 Workbook Page 205

256 Gas System Sizing Problem 2. Determine length to the most remote outlet: Section 1: Section 2: Section 3: Section 4: Section 5: 15 ft. (4572 mm) 25 ft. (7620 mm) 5 ft. (1524 mm) 5 ft. (1524 mm) 30 ft. (9144 mm) Total pipe length to most remote outlet: 80 ft. ( mm) 2012 IMC Performing Commercial Mechanical Inspection 256 Workbook Page 206

257 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) Table 402.4(2) 2012 IMC Performing Commercial Mechanical Inspection 257 Workbook Page 206

258 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 2012 IMC Performing Commercial Mechanical Inspection 258 Workbook Page 206

259 Gas System Sizing Problem 5. Locate nominal size of pipe required: Outlet C: 73 cfh requires 3/4 inch pipe (2.07 m 3 /hr requires 19.1 mm) Outlet D: 133 cfh requires 1 inch pipe (3.76 m 3 /hr requires 25.4mm) Pipe Section 4 (A,B,C): 138 cfh requires 1 inch pipe (3.91 m 3 /hr requires 25.4mm) Pipe Section 5 (A,B,C,D): 271 cfh requires 1 ¼ inch pipe (7.67 m 3 /hr requires 31.8mm) 2012 IMC Performing Commercial Mechanical Inspection 259 Workbook Page 206

260 Branch Length Method Determine the size of gas piping sections 2012 IMC Performing Commercial Mechanical Inspection 260 Workbook Page 207

261 Branch Length Method G RANGE 60 MBH 15 ALL BRANCHES CSST I WATER HEATER 40 MBH 15 J FURNACE 75 MBH 15 POINT OF DELIVERY 9 WC PRESSURE A 10 B 10 C 25 SCHEDULE 40 STEEL TRUNKLINE D 15 E 5 CSST SPECIFIC GRAVITY 0.60 LONGEST RUN 20 F H 20 GAS GRILL 20 MBH CLOTHES DRYER 35 MBH (MBH = 1,000 Btu/h) For SI: 1 inch = 25.4 mm, 1 foot = mm 2012 IMC Performing Commercial Mechanical Inspection 261 Workbook Page 207

262 Branch Length Method 1. 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 IMC Performing Commercial Mechanical Inspection 262 Workbook Page 208

263 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 = ½ inch (9.5 mm) 2012 IMC Performing Commercial Mechanical Inspection 263 Workbook Page 208

264 Check Your Learning: Answers A. Determine the load for the following branch sections Section F: Section G: Section H: Section I: Section J: 20 cfh (0.71 m 3 /hr) 60 cfh (1.7 m 3 /hr) 35 cfh (0.99 m 3 /hr) 40 cfh (1.13 m 3 /hr) 75 cfh (2.12 m 3 /hr) 2012 IMC Performing Commercial Mechanical Inspection 264 Workbook Page 211

265 Check Your Learning: Answers B. Determine the length for each branch Section F: 85 ft. ( mm) Section G: 25 ft. (7620 mm) Section H: 40 ft. ( mm) Section I: 60 ft. ( mm) Section J: 75 ft. ( mm) C. Determine the table to use Table 402.4(15) 2012 IMC Performing Commercial Mechanical Inspection 265 Workbook Page 211

266 Check Your Learning: Answers D. Determine the size for each section of gas pipe. Pipe Section Length (ft.) Load (MBH) Size F G H I J IMC Performing Commercial Mechanical Inspection 266 Workbook Page 201

267 Hybrid Pressure System Sizing RTU MBH RTU MBH 10 G J 15 RTU MBH F 40 9 INCHES WC E 25 RTU MBH POUNDS-TO-INCHES REGULATORS I 20 H 15 9 INCHES WC SERVICE REGULATOR 5 PSIG A 10 B C 10 D METER SCHEDULE 40 STEEL PIPING THROUGHOUT 2012 IMC Performing Commercial Mechanical Inspection 267 Workbook Page 212

268 Parallel System Practice 2012 IMC Performing Commercial Mechanical Inspection 268 Workbook Page 215

269 Check Your Learning: Answers Required Size (CSST) A 37 B 25 C 19 D 23 E 23 F 18 G IMC Performing Commercial Mechanical Inspection 269 Workbook Page 215

270 Medium Pressure System 2012 IMC Performing Commercial Mechanical Inspection 270 Workbook Page 217

271 Medium Pressure System Required Size (CSST) A 18 B 15 C 13 D 13 E 15 F 13 G IMC Performing Commercial Mechanical Inspection 271 Workbook Page 217

272 Branch Length Method 2012 IMC Performing Commercial Mechanical Inspection 272 Workbook Page 221

273 Branch Length Method Required Size (Schedule 40) Required Size (CSST) A B C D E F G 1 ¼ (31.8 mm) 1 ¼ (31.8 mm) 1 (25.4 mm) 1 (25.4 mm) ¾ (19.1 mm) ¾ (19.1 mm) 1/2 (12.7 mm) H 13 I 23 J 15 K 18 L 15 M 18 N IMC Performing Commercial Mechanical Inspection 273 Workbook Page 221

274 2012 IMC Performing Commercial Mechanical Inspection 274 Workbook Page 222

275 Task 3: Inspect Piping Materials 1. Check corrugated stainless steel tubing. IFGC Section Check plastic tubing. IFGC Section Check copper tubing. IFGC Section Check protective coating and wrapping. IFGC Section Check number and length of threads. IFGC Section IMC Performing Commercial Mechanical Inspection 275 Workbook Page

276 Task 4: Inspect Piping System Installation 1. Check prohibited location. IFGC Section Check piping in concealed locations. IFGC Section Check piping through foundation walls is prohibited, underground penetration prohibited. IFGC Section Check protection against physical damage. IFGC Section Check piping in solid floors. IFGC Section IMC Performing Commercial Mechanical Inspection 276 Workbook Page

277 Piping Through Foundation Wall 2012 IMC Performing Commercial Mechanical Inspection 277 Workbook Page

278 Alternative Piping Through Solid Floors 2012 IMC Performing Commercial Mechanical Inspection 278 Workbook Page

279 Task 4: Inspect Piping System Installation 6. Check minimum burial depth. IFGC Section Check individual outdoor appliances. IFGC Section Check inspection, testing and purging. IFGC Section Check appliance isolation. IFGC Section Inspect gas flow control. IFGC Section IMC Performing Commercial Mechanical Inspection Workbook Page

280 Gas Flow Controls 2012 IMC Performing Commercial Mechanical Inspection 280 Workbook Page

281 Gas Flow Controls 2012 IMC Performing Commercial Mechanical Inspection 281 Workbook Page

282 Gas Pressure Regulator 2012 IMC Performing Commercial Mechanical Inspection 282 Workbook Page

283 Task 5: Inspect Gas Flow Controls 1. Check MP regulators. IFGC Section Check venting regulators. IFGC Section Check appliance connections. IFGC Section Check protection from damage. IFGC Section Check movable appliances. IFGC Section IMC Performing Commercial Mechanical Inspection 283 Workbook Page

284 International Code Council is a Registered Provider with The American Institute of Architects Continuing Education Systems. Credit earned on completion of this program will be reported to CES Records for AIA members. Certificates of Completion for non-aia members are available on request. This program is registered with the AIA/CES for continuing professional education. As such, it does not include content that may be deemed or construed to be an approval or endorsement by the AIA of any material of construction or any method or manner of handling, using, distributing, or dealing in any material or product. Questions related to specific materials, methods, and services will be addressed at the conclusion of this presentation IMC Performing Commercial Mechanical Inspection 284

285 Copyright Materials This presentation is protected by US and International Copyright laws. Reproduction, distribution, display and use of the presentation without written permission of the speaker is prohibited. International Code Council IMC Performing Commercial Mechanical Inspection 285