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Expiratory flow can be through filters or through one way flutter valves. These screw onto the loop and create an airtight, penetration through the bag.

Flutter valves are fashioned from a cut-off glove finger rubber banded onto Flutter Valve Penetrator. End of finger is cut to allow air exit, but stop reverse inflow.

Bunny PAPR with correct inflow rate maintains continuous positive pressure. The flutter valves should rarely if ever need to close.

Test that your airflow and expiratory fittings configuration maintains bag inflated even during inspiration The bag should only collapse inward about 1 cm.

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