At the minimum, a battery room ventilation system must include: The BHS Battery Room Ventilation System contains each of these components, along with fully integrated elements that automatically activate Hydrogen Exhaust Fans when the concentration of the dangerous gas reaches 1 percent or more.
An alternative variation of continuous ventilation in air conditioned battery room spaces is to utilize, as makeup air, the conditioned air from other occupied spaces that would require ventilation as part of the indoor air quality requirements. Intermittent Ventilation, Monitoring, and Limiting H2 Concentration
According to the National Electrical Code, (NEC) the battery room should be ventilated, as required by NFPA 70 480.10 (A). “Ventilation. Provisions appropriate to the battery technology shall be made for sufficient diffusion and ventilation of gases from the battery — to prevent the accumulation of an explosive mixture.”
The battery is 3m. Determine the ventilation rate to limit hydrogen concentration to less than 1%. Room Volume, RV = 4 x 2 x 3 = 24 m3. the room will need to be changed 4.79 times per hour, or about five times per hour. NFPA 70E. Battery room shall be ventilated at high points for removal of accumulated hydrogen.
Another acceptable ventilation method is to provide continuous ventilation at a rate of not less than 1 cubic foot per minute per square foot (1 ft3 /min/ft2) [0.0051 m3 /s · m2 ] of floor area of the room. IFC 608.5; NFPA 1 52.3.5; IEEE-1188 4.2 IFC and NFPA1 codes require neutralization for VRLA batteries.
Ventilation systems for stationary batteries must address human health and safety, fire safety, equipment reliability and safety, as well as human comfort. The ventilation system must prevent the accumulation of hydrogen pockets greater than 1% concentration.