how often do we need to change the oxygen inside SCBA cylinder . for firefighters if the cylinders didn't use for long time.
The air in an SCBA bottle is just atmospheric air, it doesn't need to be changed, just topped off maybe if it is lower than 4500 pounds
The SCBA cylinder does not have Oxygen. The cylinder has compressed breathing air. Oxygen is a oxidizer and would be an enhancement to a fire condition.
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