Hydrogen Gas Ventilation Calculator for Motive Power Battery Rooms

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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.

Ventilation Calculator

Step 1: Hydrogen Concentration



Volume of Hydrogen produced during recharge Both fields are required

Step 2: Room Volume (for a room with a flat roof)

(ft.)
(ft.)
(ft.)
Total Volume of Room XX

Step 3: Hydrogen Gas Produced per Hour

Volume of Hydrogen XX ft. (Result from Step 1)

Hydrogen Gas Produced per Hour Above field is required

Step 4: Ventilation Requirement

Volume of Room XX cubic feet (Result from Step 2)
Hydrogen Gas Produced per Hour XX cubic feet (Result from Step 3)
Max. percentage of hydrogen gas allowed 1% (Industry Standard)
Complete Air Exchange Every XX

Step 5: Fan Requirement

Volume of Room XX cubic feet (Result from Step 2)
Complete Air Exchange Every XX minutes (Result from Step 4)
Fan Requirement XX

Step 6: Percentage of Hydrogen Gas

Hydrogen Gas Produced Per Hour XX cubic feet (Result from Step 3)
Total Volume of Room XX cubic feet (Result from Step 2)
Percentage of Hydrogen Gas .XX