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NYC Mechanical Code

§ 502.9.5.4 — § 502.9.5.4

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What is NYC MC § 502.9.5.4?

Quick Answer

This section mandates continuous mechanical ventilation for the use, dispensing, and mixing of flammable and combustible liquids in amounts exceeding specified limits. It requires a minimum ventilation rate and provisions for makeup air to prevent hazardous vapor accumulation. Applies to facilities handling such materials.

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

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502.9.5.4 Use, dispensing and mixing.

MC § 502.9.5.4

Continuous mechanical ventilation shall be provided for the use, dispensing and mixing of flammable and combustible liquids in open or closed systems in amounts exceeding the maximum allowable quantity per control area and for bulk transfer and process transfer operations. The ventilation rate shall be not less than 1 cfm/ft 2 (0.00508 m 3 /(s • m 2 )) of floor area over the design area. Provisions shall be made for the introduction of makeup air in a manner that will include all floor areas or pits where vapors can collect. Local or spot ventilation shall be provided where needed to prevent the accumulation of hazardous vapors.

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