New Scott SCBA Familiarization

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[@raulluna9319]

Good Morning, I have 3 questions one of my test is asking if the Bypass valve should be on or off? I'm assuming during operations and the other the tank is 100% full or 50% full it sounds dumb right why would you have it a 50% full but anyway I want to make sure. and last one the face mask is on positive pressure or negative pressure. any help with these would be really appreciate it. thx for all you do out there fellows.