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Breathing Apparatus
OBA Type A-3 Canister The quick-starting canister incorporates 2 oxygen generating candle which supplies oxygen until normal oxygen generation begins. Normal oxygen generation occurs when the wearer exhales moisture and CO2. The rate of oxygen generation is proportional to the amount of CO2 and moisture in the exhaled breath. The quantity of moisture and CO2 in the exhaled breath is determined by how hard the wearer is working.
Type A-3 OBA canisters have a curved shape, allowing the canister to be inserted into the OBA in only one way. In addition, the back of the canister for the Type A-3 OBA has horizontal ribs and a label to identify the back side from the front side.
The design was changed elimnating one of the chlorate candles. Sailors would use the second candle as an extra supply of oxygen.
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