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With correct combination of blower fan and output flutter valves, flow through PAPR is 20 to 35 L/min. In that flow range, there should be little to no fogging during non-strenuous activity.

Most common cause of fogging is incomplete fenestration of bag penetrations. Check that filter and expiratory penetrations through bag are fully open.

Applying F.R.E.D. defogger to inside of window is helpful if you still find fogging to be an issue.

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