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NYC Building Code

§ 909.20.4.4 — § 909.20.4.4

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What is NYC BC § 909.20.4.4?

Quick Answer

This section outlines the requirements for stairway or ramp shaft air movement systems, specifying the need for a dampered relief opening and sufficient air supply to maintain designated positive pressure levels. Applies to building owners responsible for compliance with ventilation standards in stairway or ramp shafts.

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

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909.20.4.4 Stairway or ramp shaft air movement system.

BC § 909.20.4.4

The stairway or ramp shaft shall be provided with a dampered relief opening and supplied with sufficient air to maintain a minimum positive pressure of 0.10 inch of water (24.9 Pa) in the shaft relative to the vestibule with all doors closed. The system shall maintain a maximum of 0.35 inch of water (87.2 Pa) in the shaft relative to the building measured with all stairway doors closed under maximum anticipated stack pressures.

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