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Breathing Apparatus  

 

OBA Type A-4 Canister

 

The quick-starting canister incorporates an 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-4 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-4 OBA has horizontal ribs and a label to identify the back side from the front side.

Image of OBA canister

See also OBA.

Components

Image of OBA canister, showing top (angled view), rubber gasket, sodium chlorate, lanyard, copper foil seal, and candle starter. Also indicated is the path of oxygen, CO2 and H2O, and potassium super oxides through the canister.

 

 
For more information, see the Index.