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502.4.1 Hydrogen limit in rooms.
For flooded lead acid, flooded nickel cadmium and VRLA batteries, the ventilation system shall be designed to limit the maximum concentration of hydrogen to 1.0 percent of the total volume of the room.
502.4.2 Ventilation rate in rooms.
Continuous ventilation shall be provided at a rate of not less than 1 cubic foot per minute per square foot (cfm/ft
2
) (0.00508 m
3
/(s • m
2
)) of floor area of the room.
502.4.3 Supervision.
Mechanical ventilation systems required by Section 502.4 shall be supervised with proof of airflow by a central, proprietary system or remote station service or shall initiate an audible and visual signal at a constantly attended on-site location.
502.5 Valve-regulated lead-acid batteries in cabinets.
Valve-regulated lead-acid (VRLA) batteries installed in cabinets, as regulated by Section 608.6.2 of the New York City Fire Code, shall be provided with ventilation in accordance with Section 502.5.3 and either Section 502.5.1 or 502.5.2.
502.5.1 Hydrogen limit in cabinets.
The cabinet ventilation system shall be designed to limit the maximum concentration of hydrogen to 1.0 percent of the total volume of the cabinet during the worst-case event of simultaneous boost charging of all batteries in the cabinet.
502.5.2 Ventilation rate in cabinets.
Continuous cabinet ventilation shall be provided at a rate of not less than 1 cubic foot per minute per square foot (cfm/ft
2
) (0.00508 m
3
/(s • m
2
)) of the floor area covered by the cabinet. The room in which the cabinet is installed shall be ventilated as required by Section 502.4.1 or 502.4.2.
502.5.3 Supervision.
Mechanical ventilation systems required by Section 502.5 shall be supervised with proof of airflow by a central, proprietary system or remote station service or shall initiate an audible and visual signal at a constantly attended on-site location.
502.6 Dry cleaning plants.
Mechanical ventilation in dry cleaning plants shall be provided and shall be adequate to protect employees and the public in accordance with this section and DOL 29 CFR Part 1910.1000, where applicable. Dry cleaning separations must comply with the requirements of Section 415.9.3 of the New York City Building Code and NFPA 32.
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