What is the purpose of turning the exhaust on a framing fastener gun? Could someone explain the requisites to me? I believe that it directs the exhaust away from the operator but...

I believe that it directs the exhaust away from the operator but what is the exhaust and the hand for?
Caulking My double pane vinyl window??
Answers:    The operator runs the fastener gun. That would be you. So you direct the exhaust away from yourself. It's annoying otherwise.
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To avoid getting a face full of nouns and to keep the dust down. The exhaust can be directed contained by different positions for the comfort of the operator.