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2021 International Mechanical Code (IMC) International Code Council

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2021 International Mechanical Code (IMC) International Code Council

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,101125554

, 101125554




TABLE OF CONTENTS

CHAPTER 1 SCOPE AND ADMINISTRATION . . 1-1 312 Heating and Cooling Load
Calculations . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
PART 1—SCOPE AND APPLICATION . . . . . . . . . . . . 1-1
Section CHAPTER 4 VENTILATION . . . . . . . . . . . . . . . . . . 4-1
101 Scope and General Requirements. . . . . . . . . . . . . . 1-1 Section
102 Applicability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 401 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
402 Natural Ventilation. . . . . . . . . . . . . . . . . . . . . . . . . 4-1
PART 2—ADMINISTRATION AND 403 Mechanical Ventilation . . . . . . . . . . . . . . . . . . . . . 4-2
ENFORCEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 404 Enclosed Parking Garages . . . . . . . . . . . . . . . . . . . 4-5
103 Code Compliance Agency . . . . . . . . . . . . . . . . . . . 1-2 405 Systems Control . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
104 Duties and Powers of the Code Official . . . . . . . . . 1-2 406 Ventilation of Uninhabited Spaces . . . . . . . . . . . . 4-5
105 Approval. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 407 Ambulatory Care Facilities and Group I-2
106 Permits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 Occupancies . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
107 Temporary Equipment, Systems and Uses. . . . . . . 1-5
108 Inspections and Testing . . . . . . . . . . . . . . . . . . . . . 1-5 CHAPTER 5 EXHAUST SYSTEMS . . . . . . . . . . . . . 5-1
109 Fees. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6 Section
110 Construction Documents . . . . . . . . . . . . . . . . . . . . 1-7 501 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
111 Notice of Approval. . . . . . . . . . . . . . . . . . . . . . . . . 1-7 502 Required Systems. . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
112 Service Utilities . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7 503 Motors and Fans. . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9
113 Stop Work Order . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7 504 Clothes Dryer Exhaust . . . . . . . . . . . . . . . . . . . . . . 5-9
114 Means of Appeals . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8 505 Domestic Cooking Exhaust Equipment . . . . . . . . 5-11
115 Violations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8 506 Commercial Kitchen Hood Ventilation
System Ducts and Exhaust Equipment . . . . . . 5-12
CHAPTER 2 DEFINITIONS . . . . . . . . . . . . . . . . . . . 2-1 507 Commercial Kitchen Hoods. . . . . . . . . . . . . . . . . 5-17
Section 508 Commercial Kitchen Makeup Air . . . . . . . . . . . . 5-20
201 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 509 Fire Suppression Systems . . . . . . . . . . . . . . . . . . 5-20
202 General Definitions . . . . . . . . . . . . . . . . . . . . . . . . 2-1 510 Hazardous Exhaust Systems . . . . . . . . . . . . . . . . 5-21
511 Dust, Stock and Refuse Conveying Systems . . . . 5-23
CHAPTER 3 GENERAL REGULATIONS . . . . . . . 3-1 512 Subslab Soil Exhaust Systems . . . . . . . . . . . . . . . 5-24
Section 513 Smoke Control Systems. . . . . . . . . . . . . . . . . . . . 5-24
301 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 514 Energy Recovery Ventilation Systems . . . . . . . . 5-28
302 Protection of Structure . . . . . . . . . . . . . . . . . . . . . . 3-2
303 Equipment and Appliance Location . . . . . . . . . . . . 3-3 CHAPTER 6 DUCT SYSTEMS . . . . . . . . . . . . . . . . . 6-1
304 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3 Section
305 Piping Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5 601 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
306 Access and Service Space . . . . . . . . . . . . . . . . . . . 3-5 602 Plenums . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
307 Condensate Disposal . . . . . . . . . . . . . . . . . . . . . . . 3-7 603 Duct Construction and Installation . . . . . . . . . . . . 6-4
308 Clearance Reduction. . . . . . . . . . . . . . . . . . . . . . . . 3-8 604 Insulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6
309 Temperature Control . . . . . . . . . . . . . . . . . . . . . . 3-10 605 Air Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7
310 Explosion Control. . . . . . . . . . . . . . . . . . . . . . . . . 3-10 606 Smoke Detection Systems Control . . . . . . . . . . . . 6-7
311 Smoke and Heat Vents . . . . . . . . . . . . . . . . . . . . . 3-10 607 Duct and Transfer Openings . . . . . . . . . . . . . . . . . 6-8
608 Balancing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-14


2021 INTERNATIONAL MECHANICAL CODE xiii

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TABLE OF CONTENTS




CHAPTER 7 COMBUSTION AIR . . . . . . . . . . . . . . 7-1 927 Radiant Heating Systems . . . . . . . . . . . . . . . . . . . . 9-5
Section 928 Evaporative Cooling Equipment . . . . . . . . . . . . . . 9-5
701 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1 929 Unvented Alcohol Fuel-burning
Decorative Appliances . . . . . . . . . . . . . . . . . . . . 9-5
CHAPTER 8 CHIMNEYS AND VENTS. . . . . . . . . . 8-1 930 Large-diameter Ceiling Fans . . . . . . . . . . . . . . . . . 9-5
Section
CHAPTER 10 BOILERS, WATER HEATERS
801 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
AND PRESSURE VESSELS . . . . . . 10-1
802 Vents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2
Section
803 Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3
1001 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-1
804 Direct-vent, Integral Vent and Mechanical
1002 Water Heaters . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-1
Draft Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4
1003 Pressure Vessels . . . . . . . . . . . . . . . . . . . . . . . . . 10-1
805 Factory-built Chimneys . . . . . . . . . . . . . . . . . . . . . 8-6
1004 Boilers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-1
806 Metal Chimneys . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-6
1005 Boiler Connections . . . . . . . . . . . . . . . . . . . . . . . 10-2
CHAPTER 9 SPECIFIC APPLIANCES, 1006 Safety and Pressure Relief Valves
FIREPLACES AND SOLID and Controls . . . . . . . . . . . . . . . . . . . . . . . . . . 10-3
FUEL-BURNING EQUIPMENT . . . . 9-1 1007 Boiler Low-water Cutoff . . . . . . . . . . . . . . . . . . 10-3
Section 1008 Bottom Blowoff Valve . . . . . . . . . . . . . . . . . . . . 10-3
901 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1 1009 Hot Water Boiler Expansion Tank . . . . . . . . . . . 10-3
902 Masonry Fireplaces . . . . . . . . . . . . . . . . . . . . . . . . 9-1 1010 Gauges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-4
903 Factory-built Fireplaces . . . . . . . . . . . . . . . . . . . . . 9-1 1011 Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-4
904 Pellet Fuel-burning Appliances . . . . . . . . . . . . . . . 9-1
905 Fireplace Stoves and Room Heaters. . . . . . . . . . . . 9-1 CHAPTER 11 REFRIGERATION . . . . . . . . . . . . . 11-1
906 Factory-built Barbecue Appliances . . . . . . . . . . . . 9-1 Section
907 Incinerators and Crematories . . . . . . . . . . . . . . . . . 9-2 1101 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-1
908 Cooling Towers, Evaporative 1102 System Requirements . . . . . . . . . . . . . . . . . . . . . 11-1
Condensers and Fluid Coolers . . . . . . . . . . . . . . 9-2 1103 Refrigeration System Classification . . . . . . . . . . 11-2
909 Vented Wall Furnaces . . . . . . . . . . . . . . . . . . . . . . 9-2 1104 System Application Requirements . . . . . . . . . . . 11-3
910 Floor Furnaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-2 1105 Machinery Room, General Requirements. . . . . 11-10
911 Duct Furnaces. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-3
1106 Machinery Room, Special Requirements . . . . . 11-11
912 Infrared Radiant Heaters . . . . . . . . . . . . . . . . . . . . 9-3
1107 Piping Material . . . . . . . . . . . . . . . . . . . . . . . . . 11-12
913 Clothes Dryers . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-3
1108 Joints and Connections . . . . . . . . . . . . . . . . . . . 11-13
914 Sauna Heaters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-3
1109 Refrigerant Pipe Installation . . . . . . . . . . . . . . . 11-14
915 Engine and Gas Turbine-powered
Equipment and Appliances. . . . . . . . . . . . . . . . . 9-4 1110 Refrigeration Piping System Test . . . . . . . . . . . 11-16
916 Pool and Spa Heaters . . . . . . . . . . . . . . . . . . . . . . . 9-4 1111 Periodic Testing . . . . . . . . . . . . . . . . . . . . . . . . 11-17
917 Cooking Appliances . . . . . . . . . . . . . . . . . . . . . . . . 9-4
CHAPTER 12 HYDRONIC PIPING . . . . . . . . . . . . 12-1
918 Forced-air Warm-air Furnaces . . . . . . . . . . . . . . . . 9-4
Section
919 Conversion Burners . . . . . . . . . . . . . . . . . . . . . . . . 9-4
920 Unit Heaters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-4 1201 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-1
921 Vented Room Heaters . . . . . . . . . . . . . . . . . . . . . . 9-4 1202 Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-1
922 Kerosene and Oil-fired Stoves . . . . . . . . . . . . . . . . 9-4 1203 Joints and Connections . . . . . . . . . . . . . . . . . . . . 12-2
923 Small Ceramic Kilns . . . . . . . . . . . . . . . . . . . . . . . 9-5 1204 Pipe Insulation . . . . . . . . . . . . . . . . . . . . . . . . . . 12-4
924 Stationary Fuel Cell Power Systems . . . . . . . . . . . 9-5 1205 Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-4
925 Masonry Heaters. . . . . . . . . . . . . . . . . . . . . . . . . . . 9-5 1206 Piping Installation . . . . . . . . . . . . . . . . . . . . . . . . 12-4
926 Gaseous Hydrogen Systems . . . . . . . . . . . . . . . . . . 9-5 1207 Transfer Fluid . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-5



xiv 2021 INTERNATIONAL MECHANICAL CODE

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