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Lead acid motive power batteries produce hydrogen gas at 80% recharge point, making proper ventilation in the battery charging area extremely important.
Hydrogen gas is colorless and odorless, and is lighter than air, causing the gas to rise to the top of a building. The concentration of hydrogen in the air should be kept below 1% to reduce risk of explosion.
The calculator provided below is for industrial/forklift charging areas and is for reference only.