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NYC Building Code

§ 909.6.1 — § 909.6.1

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What is NYC BC § 909.6.1?

Quick Answer

This section establishes the minimum pressure difference required across smoke barriers in buildings. For fully sprinklered buildings, the minimum is set at 0.05-inch water gauge, while in buildings that are not fully sprinklered, the smoke control system must achieve pressure differences at least double the maximum calculated from the design fire. Applies to building owners responsible for smoke control systems.

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

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909.6.1 Minimum pressure difference.

BC § 909.6.1

The minimum pressure difference across a smoke barrier shall be 0.05-inch water gauge (0.0 124 kPa) in fully sprinklered buildings. In buildings permitted to be other than fully sprinklered, the smoke control system shall be designed to achieve pressure differences not less than two times the maximum calculated pressure difference produced by the design fire.

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