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Title 28: New York City Construction Codes
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Article 801: Enactment and Update of the New York City Mechanical Code
§ 28-801.1 Update.
§ 28-801.2 Enactment of the New York City Mechanical Code.
Chapter 1: Administration
Chapter 2: Definitions
Chapter 3: General Regulations
Chapter 4: Ventilation
Chapter 5: Exhaust Systems
Section MC 501: General
Section MC 502: Required Systems
502.1 General.
502.1.1 Exhaust location.
502.1.2 Fuel-dispensing areas.
502.1.3 Equipment, appliance and service rooms.
502.1.4 Hazardous exhaust.
502.2 Aircraft fueling and defueling.
502.3 Battery-charging areas for powered vehicles and equipment.
502.4 Stationary storage battery systems.
502.4.1 Hydrogen limit in rooms.
502.4.2 Ventilation rate in rooms.
502.4.3 Supervision.
502.5 Valve-regulated lead-acid batteries in cabinets.
502.5.1 Hydrogen limit in cabinets.
502.5.2 Ventilation rate in cabinets.
502.5.3 Supervision.
502.6 Dry cleaning plants.
502.6.1 Type II and III systems.
502.6.2 Type IV and V systems.
502.6.3 Spotting and pretreating.
502.7 Application of flammable finishes.
502.7.1 During construction.
502.7.2 Limited spraying spaces.
502.7.3 Flammable vapor areas.
502.7.3.1 Operation.
502.7.3.2 Recirculation.
502.7.3.3 Air velocity.
502.7.3.3.1 Open face or open front spray booth.
502.7.3.3.2 Enclosed spray booth or spray room with openings for product conveyance.
502.7.3.4 Ventilation obstruction.
502.7.3.5 Independent ducts.
502.7.3.6 Fan motors and belts.
502.7.4 Dipping operations.
502.7.5 Electrostatic apparatus.
502.7.6 Powder coating.
502.7.7 Floor resurfacing operations.
502.7.8 Resin application areas.
502.8 Hazardous materials - general requirements.
502.8.1 Storage in excess of the maximum allowable quantities.
502.8.1.1 System requirements.
502.8.2 Gas rooms, exhausted enclosures and gas cabinets.
502.8.3 Indoor dispensing and use.
502.8.4 Indoor dispensing and use - point sources.
502.8.5 Closed systems.
502.9 Hazardous materials - requirements for specific materials.
502.9.1 Compressed gases - medical gas systems.
502.9.2 Corrosives.
502.9.3 Cryogenics.
502.9.4 Explosives.
502.9.5 Flammable and combustible liquids.
502.9.5.1 Vaults.
502.9.5.2 Storage rooms and warehouses.
502.9.5.3 Cleaning machines.
502.9.5.4 Use, dispensing and mixing.
502.9.5.5 Bulk plants or terminals.
502.9.5.5.1 General.
502.9.5.5.2 Basements and pits.
502.9.5.5.3 Dispensing of Class I liquids.
502.9.6 Highly toxic and toxic liquids.
502.9.6.1 Treatment system.
502.9.6.2 Open and closed systems.
502.9.7 Highly toxic and toxic compressed gases - any quantity.
502.9.7.1 Gas cabinets.
502.9.7.2 Exhausted enclosures.
502.9.8 Highly toxic and toxic compressed gases - quantities exceeding the maximum allowable quantity per control area.
502.9.8.1 Ventilated areas.
502.9.8.2 Local exhaust for portable tanks.
502.9.8.3 Piping and controls - stationary tanks.
502.9.8.4 Gas rooms.
502.9.8.5 Treatment system.
502.9.8.6 Process equipment.
502.9.9 Ozone gas generators.
502.9.10 LP-gas distribution facilities.
502.9.11 Silane gas.
502.10 Hazardous production materials (HPM).
502.10.1 Where required.
502.10.2 Penetrations.
502.10.3 Treatment systems.
502.11 Motion picture projectors.
502.11.1 Projectors with an exhaust discharge.
502.11.2 Projectors without exhaust connection.
502.12 Organic coating processes.
502.13 Public garages.
502.14 Motor vehicle operation.
502.15 Repair garages.
502.16 Repair garages for natural gas- and hydrogen-fueled vehicles.
502.16.1 Design.
502.16.2 Operation.
502.17 Tire rebuilding or recapping.
502.17.1 Buffing machines.
502.18 Specific rooms.
502.19 Indoor firing ranges.
502.20 Manicure and pedicure stations.
502.21 Domestic kitchen exhaust systems.
502.22 Nonproduction chemical laboratories.
Section MC 503: Motors and Fans
Section MC 504: Clothes Dryer Exhaust
Section MC 505: Domestic Kitchen Exhaust Equipment
Section MC 506: Commercial Kitchen Hood Ventilation System Ducts and Exhaust Equipment
Section MC 507: Commercial Kitchen Hoods
Section MC 508: Commercial Kitchen Makeup Air
Section MC 509: Fire Suppression Systems
Section MC 510: Hazardous Exhaust Systems
Section MC 511: Dust, Stock and Refuse Conveying Systems
Section MC 512: Subslab Soil Exhaust Systems
Section MC 513: Smoke Control Systems
Section MC 514: Energy Recovery Ventilation Systems
Section MC 515: Postfire Smoke Purge Systems
Chapter 6: Duct Systems
Chapter 7: Combustion, Ventilation, and Dilution Air
Chapter 8: Chimneys and Vents
Chapter 9: Specific Appliances and Equipment
Chapter 10: Boilers, Water Heaters and Pressure Vessels
Chapter 11: Refrigeration
Chapter 12: Hydronic Piping
Chapter 13: Fuel-Oil Piping and Storage
Chapter 14: Solar Systems
Chapter 15: Referenced Standards
Appendix A: Chimney Connector Pass-Throughs
Appendix B: Reserved
Appendix C: Fuel Oil Storage Tank Venting Options
Chapter 9: New York City Fuel Gas Code
Chapter 10: New York City Energy Code
Chapter 11: The New York City Electrical Code
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Title 30: Emergency Management
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Appendix A: Unconsolidated Local Laws
The Rules of the City of New York
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Title 25: Department of Mental Health and Retardation [Repealed]
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Title 74: Community Hiring
501.6 Independent system required.
The following shall be independent of other exhaust systems:
   1.   Single or combined mechanical exhaust systems from bath, toilet, urinal, locker, service sink closets and similar rooms shall be independent of all other exhaust systems, except as permitted in Section 501.3.1.
   2.   A separate grease duct system shall be provided for each Type I hood except as provided in Section 506.3.5.
   3.   Hazardous exhaust systems shall be independent of other types of exhaust systems as provided in Section 510.
Section MC 502: Required Systems
502.1 General.
An exhaust system shall be provided, maintained and operated as specifically required by this section and for all occupied areas where machines, vats, tanks, furnaces, forges, salamanders and other appliances, equipment and processes in such areas produce or throw off dust or particles sufficiently light to float in the air, or which emit heat, odors, fumes, spray, gas or smoke, in such quantities so as to be irritating or injurious to health or safety.

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