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International Mechanical Code, 3rd Printing, 2021

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International Mechanical Code, 3rd Printing, 2021

2021 IMC® INTERNATIONAL MECHANICAL CODE®
2021 IMC® INTERNATIONAL MECHANICAL CODE® TITLE PAGE
COPYRIGHT
PREFACE
ARRANGEMENT AND FORMAT OF THE 2021 IMC
TABLE OF CONTENTS
CHAPTER 1 SCOPE AND ADMINISTRATION [Go to Page]
PART 1—SCOPE AND APPLICATION [Go to Page]
SECTION 101 SCOPE AND GENERAL REQUIREMENTS
SECTION 102 APPLICABILITY
PART 2—ADMINISTRATION AND ENFORCEMENT [Go to Page]
SECTION 103 CODE COMPLIANCE AGENCY
SECTION 104 DUTIES AND POWERS OF THE CODE OFFICIAL
SECTION 105 APPROVAL
SECTION 106 PERMITS
SECTION 107 CONSTRUCTION DOCUMENTS
SECTION 108 NOTICE OF APPROVAL
SECTION 109 FEES
SECTION 110 SERVICE UTILITIES
SECTION 111 TEMPORARY EQUIPMENT, SYSTEMS AND USES
SECTION 112 INSPECTIONS AND TESTING
SECTION 113 MEANS OF APPEALS
SECTION 114 BOARD OF APPEALS
SECTION 115 VIOLATIONS
SECTION 116 STOP WORK ORDER
CHAPTER 2 DEFINITIONS [Go to Page]
SECTION 201 GENERAL
SECTION 202 GENERAL DEFINITIONS
CHAPTER 3 GENERAL REGULATIONS [Go to Page]
SECTION 301 GENERAL
SECTION 302 PROTECTION OF STRUCTURE
SECTION 303 EQUIPMENT AND APPLIANCE LOCATION
SECTION 304 INSTALLATION
SECTION 305 PIPING SUPPORT [Go to Page]
TABLE 305.4 PIPING SUPPORT SPACINGa
SECTION 306 ACCESS AND SERVICE SPACE
SECTION 307 CONDENSATE DISPOSAL [Go to Page]
TABLE 307.2.2 CONDENSATE DRAIN SIZING
SECTION 308 CLEARANCE REDUCTION [Go to Page]
TABLE 308.4.2 CLEARANCE REDUCTION METHODSb
SECTION 309 TEMPERATURE CONTROL
SECTION 310 EXPLOSION CONTROL
SECTION 311 SMOKE AND HEAT VENTS
SECTION 312 HEATING AND COOLING LOAD CALCULATIONS
CHAPTER 4 VENTILATION [Go to Page]
SECTION 401 GENERAL [Go to Page]
TABLE 401.5 OPENING SIZES IN LOUVERS, GRILLES AND SCREENS PROTECTING AIR INTAKE OPENINGS
SECTION 402 NATURAL VENTILATION
SECTION 403 MECHANICAL VENTILATION [Go to Page]
EQUATION 4-1
TABLE 403.3.1.1.1.2 ZONE AIR DISTRIBUTION EFFECTIVENESS
EQUATION 4-2
EQUATION 4-3
EQUATION 4-4
EQUATION 4-5
TABLE 403.3.1.1.2.3.2 SYSTEM VENTILATION EFFICIENCYa
EQUATION 4-6
EQUATION 4-7
EQUATION 4-8
EQUATION 4-9
TABLE 403.3.2.3 MINIMUM REQUIRED LOCAL EXHAUST RATES FOR GROUP R-2, R-3 AND R-4 OCCUPANCIES
SECTION 404 ENCLOSED PARKING GARAGES
SECTION 405 SYSTEMS CONTROL
SECTION 406 VENTILATION OF UNINHABITED SPACES
SECTION 407 AMBULATORY CARE FACILITIES AND GROUP I-2 OCCUPANCIES [Go to Page]
TABLE 403.3.1.1 MINIMUM VENTILATION RATES [Go to Page]
TABLE 403.3.1.1—continued MINIMUM VENTILATION RATES
TABLE 403.3.1.1—continued MINIMUM VENTILATION RATES
CHAPTER 5 EXHAUST SYSTEMS [Go to Page]
SECTION 501 GENERAL
SECTION 502 REQUIRED SYSTEMS [Go to Page]
EQUATION 5-1
SECTION 503 MOTORS AND FANS
SECTION 504 CLOTHES DRYER EXHAUST [Go to Page]
TABLE 504.9.4.1 DRYER EXHAUST DUCT FITTING EQUIVALENT LENGTH
SECTION 505 DOMESTIC COOKING EXHAUST EQUIPMENT
SECTION 506 COMMERCIAL KITCHEN HOOD VENTILATION SYSTEM DUCTS AND EXHAUST EQUIPMENT
SECTION 507 COMMERCIAL KITCHEN HOODS [Go to Page]
TABLE 507.2.8 MINIMUM DISTANCE BETWEEN THE LOWEST EDGE OF A GREASE FILTER AND THE COOKING SURFACE OR THE HEATING SURFACE
SECTION 508 COMMERCIAL KITCHEN MAKEUP AIR
SECTION 509 FIRE SUPPRESSION SYSTEMS
SECTION 510 HAZARDOUS EXHAUST SYSTEMS [Go to Page]
TABLE 510.8 MINIMUM DUCT THICKNESS
TABLE 510.8.2 CLEARANCE TO COMBUSTIBLES
SECTION 511 DUST, STOCK AND REFUSE CONVEYING SYSTEMS [Go to Page]
TABLE 511.2 CONSTRUCTION, CLEARANCE AND TERMINATION REQUIREMENTS FOR SINGLE-WALL METAL CHIMNEYS
SECTION 512 SUBSLAB SOIL EXHAUST SYSTEMS
SECTION 513 SMOKE CONTROL SYSTEMS [Go to Page]
EQUATION 5-2
EQUATION 5-3
SECTION 514 ENERGY RECOVERY VENTILATION SYSTEMS
CHAPTER 6 DUCT SYSTEMS [Go to Page]
SECTION 601 GENERAL
SECTION 602 PLENUMS
SECTION 603 DUCT CONSTRUCTION AND INSTALLATION [Go to Page]
TABLE 603.4 DUCT CONSTRUCTION MINIMUM SHEET METAL THICKNESS FOR SINGLE DWELLING UNITSa
SECTION 604 INSULATION
SECTION 605 AIR FILTERS
SECTION 606 SMOKE DETECTION SYSTEMS CONTROL
SECTION 607 DUCT AND TRANSFER OPENINGS [Go to Page]
[BF] TABLE 607.3.2.1 FIRE DAMPER RATING
SECTION 608 BALANCING
CHAPTER 7 COMBUSTION AIR [Go to Page]
SECTION 701 GENERAL
CHAPTER 8 CHIMNEYS AND VENTS [Go to Page]
SECTION 801 GENERAL
SECTION 802 VENTS [Go to Page]
TABLE 802.2 VENT APPLICATION
SECTION 803 CONNECTORS [Go to Page]
TABLE 803.9(1) MINIMUM CHIMNEY CONNECTOR THICKNESS FOR LOW-HEAT APPLIANCES
TABLE 803.9(2) MINIMUM CHIMNEY CONNECTOR THICKNESS FOR MEDIUM- AND HIGH-HEAT APPLIANCES
TABLE 803.10.4 CHIMNEY CONNECTOR SYSTEMS AND CLEARANCES TOCOMBUSTIBLE WALL MATERIALS FOR DOMESTIC HEATING APPLIANCES
TABLE 803.10.6 CONNECTOR CLEARANCES TO COMBUSTIBLES
SECTION 804 DIRECT-VENT, INTEGRAL VENT AND MECHANICAL DRAFT SYSTEMS
SECTION 805 FACTORY-BUILT CHIMNEYS
SECTION 806 METAL CHIMNEYS
CHAPTER 9 SPECIFIC APPLIANCES, FIREPLACES AND SOLID FUEL-BURNING EQUIPMENT [Go to Page]
SECTION 901 GENERAL
SECTION 902 MASONRY FIREPLACES
SECTION 903 FACTORY-BUILT FIREPLACES
SECTION 904 PELLET FUEL-BURNING APPLIANCES
SECTION 905 FIREPLACE STOVES AND ROOM HEATERS
SECTION 906 FACTORY-BUILT BARBECUE APPLIANCES
SECTION 907 INCINERATORS AND CREMATORIES
SECTION 908 COOLING TOWERS, EVAPORATIVE CONDENSERS AND FLUID COOLERS
SECTION 909 VENTED WALL FURNACES
SECTION 910 FLOOR FURNACES
SECTION 911 DUCT FURNACES
SECTION 912 INFRARED RADIANT HEATERS
SECTION 913 CLOTHES DRYERS
SECTION 914 SAUNA HEATERS
SECTION 915 ENGINE AND GAS TURBINE-POWERED EQUIPMENT AND APPLIANCES
SECTION 916 POOL AND SPA HEATERS
SECTION 917 COOKING APPLIANCES
SECTION 918 FORCED-AIR WARM-AIR FURNACES
SECTION 919 CONVERSION BURNERS
SECTION 920 UNIT HEATERS
SECTION 921 VENTED ROOM HEATERS
SECTION 922 KEROSENE AND OIL-FIRED STOVES
SECTION 923 SMALL CERAMIC KILNS
SECTION 924 STATIONARY FUEL CELL POWER SYSTEMS
SECTION 925 MASONRY HEATERS
SECTION 926 GASEOUS HYDROGEN SYSTEMS
SECTION 927 RADIANT HEATING SYSTEMS
SECTION 928 EVAPORATIVE COOLING EQUIPMENT
SECTION 929 UNVENTED ALCOHOL FUEL-BURNING DECORATIVE APPLIANCES
SECTION 930 LARGE-DIAMETER CEILING FANS
CHAPTER 10 BOILERS, WATER HEATERS AND PRESSURE VESSELS [Go to Page]
SECTION 1001 GENERAL
SECTION 1002 WATER HEATERS
SECTION 1003 PRESSURE VESSELS
SECTION 1004 BOILERS [Go to Page]
TABLE 1004.3.1 BOILER TOP CLEARANCES
SECTION 1005 BOILER CONNECTIONS
SECTION 1006 SAFETY AND PRESSURE RELIEF VALVES AND CONTROLS
SECTION 1007 BOILER LOW-WATER CUTOFF
SECTION 1008 BOTTOM BLOWOFF VALVE
SECTION 1009 HOT WATER BOILER EXPANSION TANK [Go to Page]
EQUATION 10-1
TABLE 1009.2 CLOSED-TYPE EXPANSION TANK SIZING
SECTION 1010 GAUGES
SECTION 1011 TESTS
CHAPTER 11 REFRIGERATION [Go to Page]
SECTION 1101 GENERAL [Go to Page]
TABLE 1101.2 FACTORY-BUILT EQUIPMENT AND APPLIANCES
SECTION 1102 SYSTEM REQUIREMENTS
SECTION 1103 REFRIGERATION SYSTEM CLASSIFICATION [Go to Page]
TABLE 1103.1 REFRIGERANT CLASSIFICATION, AMOUNT AND OEL [Go to Page]
TABLE 1103.1—continued REFRIGERANT CLASSIFICATION, AMOUNT AND OEL
TABLE 1103.1—continued REFRIGERANT CLASSIFICATION, AMOUNT AND OEL
TABLE 1103.1—continued REFRIGERANT CLASSIFICATION, AMOUNT AND OEL
TABLE 1103.1—continued REFRIGERANT CLASSIFICATION, AMOUNT AND OEL
TABLE 1103.1—continued REFRIGERANT CLASSIFICATION, AMOUNT AND OEL
SECTION 1104 SYSTEM APPLICATION REQUIREMENTS [Go to Page]
TABLE 1104.3.2 MAXIMUM PERMISSIBLE QUANTITIES OF REFRIGERANTS
SECTION 1105 MACHINERY ROOM, GENERAL REQUIREMENTS [Go to Page]
EQUATION 11-1
EQUATION 11-2
SECTION 1106 MACHINERY ROOM, SPECIAL REQUIREMENTS [Go to Page]
TABLE 1106.4.2 MINIMUM EXHAUST RATES
SECTION 1107 PIPING MATERIAL [Go to Page]
TABLE 1107.4 REFRIGERANT PIPE
TABLE 1107.5 REFRIGERANT PIPE FITTINGS
TABLE 1107.5.1 COPPER BRAZED SWAGED CUP DEPTHS
SECTION 1108 JOINTS AND CONNECTIONS
SECTION 1109 REFRIGERANT PIPE INSTALLATION [Go to Page]
TABLE 1109.3.2 SHAFT VENTILATION VELOCITY
SECTION 1110 REFRIGERATION PIPING SYSTEM TEST
[F] SECTION 1111 PERIODIC TESTING
CHAPTER 12 HYDRONIC PIPING [Go to Page]
SECTION 1201 GENERAL
SECTION 1202 MATERIAL [Go to Page]
TABLE 1202.4 HYDRONIC PIPE
TABLE 1202.5 HYDRONIC PIPE FITTINGS
SECTION 1203 JOINTS AND CONNECTIONS
SECTION 1204 PIPE INSULATION
SECTION 1205 VALVES
SECTION 1206 PIPING INSTALLATION
SECTION 1207 TRANSFER FLUID
SECTION 1208 TESTS
SECTION 1209 EMBEDDED PIPING
SECTION 1210 PLASTIC PIPE GROUND-SOURCE HEAT PUMP LOOP SYSTEMS [Go to Page]
TABLE 1210.4 GROUND-SOURCE LOOP PIPE
TABLE 1210.5 GROUND-SOURCE LOOP PIPE FITTINGS
CHAPTER 13 FUEL OIL PIPING AND STORAGE [Go to Page]
SECTION 1301 GENERAL
SECTION 1302 MATERIAL [Go to Page]
TABLE 1302.3 FUEL OIL PIPING AND FITTINGS
SECTION 1303 JOINTS AND CONNECTIONS
SECTION 1304 PIPING SUPPORT
SECTION 1305 FUEL OIL SYSTEM INSTALLATION
SECTION 1306 OIL GAUGING
SECTION 1307 FUEL OIL VALVES
SECTION 1308 TESTING
CHAPTER 14 SOLAR THERMAL SYSTEMS [Go to Page]
SECTION 1401 GENERAL
SECTION 1402 DESIGN AND INSTALLATION
SECTION 1403 HEAT TRANSFER FLUIDS
SECTION 1404 LABELING
CHAPTER 15 REFERENCED STANDARDS [Go to Page]
ACCA
AHRI
AMCA
ANSI
ASHRAE
ASME
ASSE
ASSP
ASTM
AWS
AWWA
CPSC
CSA
DOL
FDA
FS
ICC
IIAR
MSS
NAIMA
NBBI
NFPA
NSF
SMACNA
UL
APPENDIX A CHIMNEY CONNECTOR PASS-THROUGHS [Go to Page]
SECTION A101 CHIMNEY CONNECTOR SYSTEMS [Go to Page]
FIGURE A101.1(1) CHIMNEY CONNECTOR SYSTEMS
FIGURE A101.1(2) CHIMNEY CONNECTOR SYSTEMS
APPENDIX B RECOMMENDED PERMIT FEE SCHEDULE [Go to Page]
SECTION B101 MECHANICAL WORK, OTHER THAN GAS PIPING SYSTEMS
SECTION B102 FEE FOR REINSPECTION
SECTION B103 TEMPORARY OPERATION INSPECTION FEE
SECTION B104 SELF-CONTAINED UNITS LESS THAN 2 TONS
[A] APPENDIX C BOARD OF APPEALS [Go to Page]
[A] SECTION C101 GENERAL
INDEX
EDITORIAL CHANGES
VALUABLE GUIDES TO CHANGES IN THE 2021 I-CODES®
ICC LEARNING CENTER
ICC EVALUATION SERVICE
TELEWORK WITH ICC DIGITAL CODES PREMIUM [Go to Page]