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NYC Building Code

§ 428.3.6.1 — § 428.3.6.1

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What is NYC BC § 428.3.6.1?

Quick Answer

This section outlines the construction and maintenance requirements for ducts, specifying that they must be made of sheet steel or equivalent noncombustible materials. It mandates airtight welding for exhaust ducts and smoke-tight joints, along with access hatches for cleaning and firefighting. Applies to building owners responsible for duct systems.

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

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428.3.6.1 Ducts.

BC § 428.3.6.1

Ducts shall be of sheet steel of not less than No. 16 manufacturers' standard gauge or of other equivalent noncombustible material having a melting point above 1800°F (982°C). Exhaust ducts within the building, on the discharge side of the fan, shall be welded airtight. Exhaust ducts within the building, on the suction side of the fan, shall have laps in the direction of airflow with smoke-tight joints, and shall be subjected to a smoke test in accordance with the requirements for chimneys in the New York City Mechanical Code. Access hatches with tight-closing covers shall be provided for cleaning and for fire-fighting in the exhaust system ducts.

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