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NYC Building Code

§ 909.20.4.3 — § 909.20.4.3

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What is NYC BC § 909.20.4.3?

Quick Answer

This section establishes the height requirement for vestibule ceilings, mandating that they be at least 20 inches higher than the door opening to function as a smoke and heat trap. The statute allows for height reductions only with proper approval and justification. Applies to building owners designing vestibules in compliance with fire safety regulations.

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

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909.20.4.3 Smoke trap.

BC § 909.20.4.3

The vestibule ceiling shall not be less than 20 inches (508 mm) higher than the door opening into the vestibule to serve as a smoke and heat trap and to provide an upward-moving air column. The height shall not be decreased unless approved and justified by design and test.

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