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NYC Mechanical Code

§ 506.3.4 — § 506.3.4

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What is NYC MC § 506.3.4?

Quick Answer

This section establishes the requirement for air velocity in grease duct systems serving Type I hoods, mandating a minimum of 500 feet per minute. Exceptions are noted for duct transitions that meet specific criteria. Applies to building owners and operators of commercial kitchens with Type I hoods.

General informational summary. Not legal advice for your situation. Consult an attorney before acting on any specific matter.

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506.3.4 Air velocity.

MC § 506.3.4

Grease duct systems serving a Type I hood shall be designed and installed to provide an air velocity within the duct system of not less than 500 feet per minute (2.5 m/s). Exception: The velocity limitations shall not apply within duct transitions utilized to connect ducts to differently sized or shaped openings in hoods and fans, provided that such transitions do not exceed 3 feet (914.4 mm) in length and are designed to prevent the trapping of grease.

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