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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
Section MC 401: General
Section MC 402: Natural Ventilation
Section MC 403: Mechanical Ventilation
403.1 Ventilation system.
403.2 Outdoor air required.
403.2.1 Recirculation of air.
403.2.2 Transfer air.
403.3 Outdoor air and local exhaust airflow rates.
403.3.1 Reserved.
403.3.1.1 Outdoor airflow rate.
403.3.1.1.1 Zone outdoor airflow.
403.3.1.1.1.1 Breathing zone outdoor airflow.
403.3.1.1.1.2 Zone air distribution effectiveness.
403.3.1.1.1.3 Zone outdoor airflow.
403.3.1.1.2 System outdoor airflow.
403.3.1.1.2.1 Single zone systems.
403.3.1.1.2.2 100-percent outdoor air systems.
403.3.1.1.2.3 Multiple zone recirculating systems.
403.3.1.1.2.3.1 Primary outdoor air fraction.
403.3.1.1.2.3.2 System ventilation efficiency.
403.3.1.1.2.3.3 Uncorrected outdoor air intake.
403.3.1.1.2.3.4 Outdoor air intake flow rate.
403.3.1.3 Exhaust ventilation.
403.3.1.4 System operation.
403.3.1.5 Variable air volume system control.
403.3.1.6 Balancing.
Section MC 404: Enclosed Parking Garages
Section MC 405: Systems Control
Section MC 406: Ventilation of Uninhabited Spaces
Section MC 407: Ambulatory Care Facilities and Group I-2 Occupancies
Section MC 408: Ventilation of Non-Production Chemical Laboratories
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Chapter 6: Duct Systems
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Appendix B: Reserved
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402.3 Reserved.
402.4 Reserved.
Section MC 403: Mechanical Ventilation
403.1 Ventilation system.
Mechanical ventilation shall be provided by a method of supply air and return or exhaust air. The amount of supply air shall be approximately equal to the amount of return and exhaust air. The system shall not be prohibited from producing negative or positive pressure; such pressures shall not result in door opening forces in excess of those indicated in the New York City Building Code and shall not prevent doors from closing as required by the New York City Building Code. The method to convey ventilation air shall be designed and installed in accordance with Chapter 6.

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