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NYC Mechanical Code

§ 502.9.5.5.1 — § 502.9.5.5.1

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What is NYC MC § 502.9.5.5.1?

Quick Answer

This section outlines the requirements for ventilation in rooms, buildings, and enclosures where Class I liquids are pumped, used, or transferred. It mandates that natural ventilation must have adequate openings and that mechanical ventilation is required if natural ventilation is insufficient. Applies to building owners managing facilities involving Class I liquids.

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

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502.9.5.5.1 General.

MC § 502.9.5.5.1

Ventilation shall be provided for rooms, buildings and enclosures in which Class I liquids are pumped, used or transferred. Design of ventilation systems shall consider the relatively high specific gravity of the vapors. Where natural ventilation is used, adequate openings in outside walls at floor level, unobstructed except by louvers or coarse screens, shall be provided. Where natural ventilation is inadequate, mechanical ventilation shall be provided. The natural ventilation design shall be approved for each specific application by the commissioner prior to installation and/or use.

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