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502.9.7 Highly toxic and toxic compressed gases – any quantity.
Ventilation exhaust shall be provided for highly toxic and toxic compressed gases in any quantity as required by Sections 502.9.7.1 and 502.9.7.2.
502.9.7.1 Gas cabinets.
Gas cabinets containing highly toxic or toxic compressed gases in any quantity shall comply with Section 502.8.2 and the following requirements:
   1.   The average ventilation velocity at the face of gas cabinet access ports or windows shall be not less than 200 feet per minute (1.02 m/s) with a minimum velocity of 150 feet per minute (0.76 m/s) at any point at the access port or window.
   2.   Gas cabinets shall be connected to an exhaust system.
   3.   Gas cabinets shall not be used as the sole means of exhaust for any room or area.
502.9.7.2 Exhausted enclosures.
Exhausted enclosures containing highly toxic or toxic compressed gases in any quantity shall comply with Section 502.8.2 and the following requirements:
   1.   The average ventilation velocity at the face of the enclosure shall be not less than 200 feet per minute (1.02 m/s) with a minimum velocity of 150 feet per minute (0.76 m/s).
   2.   Exhausted enclosures shall be connected to an exhaust system.
   3.   Exhausted enclosures shall not be used as the sole means of exhaust for any room or area.
502.9.8 Highly toxic and toxic compressed gases – quantities exceeding the maximum allowable quantity per control area.
Ventilation exhaust shall be provided for highly toxic and toxic compressed gases in amounts exceeding the maximum allowable quantities per control area as required by Sections 502.9.8.1 through 502.9.8.6.
502.9.8.1 Ventilated areas.
The room or area in which indoor gas cabinets or exhausted enclosures are located shall be provided with exhaust ventilation. Gas cabinets or exhausted enclosures shall not be used as the sole means of exhaust for any room or area.
502.9.8.2 Local exhaust for portable tanks.
A means of local exhaust shall be provided to capture leakage from indoor and outdoor portable tanks. The local exhaust shall consist of portable ducts or collection systems designed to be applied to the site of a leak in a valve or fitting on the tank. The local exhaust system shall be located in a gas room. Exhaust shall be directed to a treatment system where required by the New York City Fire Code.

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