By John F. "Skip" Coleman, Technical Editor It is very easy to take things for granted. Most of us in the fire service know that certain things are there, working as they should, to make our lives easier. We throw a self-contained breathing apparatus on our back, snap in the mask-mounted regulator, and inhale and we get air. Magically, these things work. How? We may not know how, but we do know that almost always, when we throw it on and inhale, we get air. If we are lucky, we are also taught what to do in the rare instance when it doesn't work. This is one of many such examples in the fire service that almost always works. Sometimes we don't know exactly how, but it works. One ...

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