4-3 Clear and Check the Mask
Seal the mask.
- Cover the openings at the bottom
of the outlet valve with the palm of
your hand.
- Blow out hard so that air escapes
around the edges of the mask.
- Cover the inlet port of the canister
with the palm of your hand.
- Breathe in.
- Remove anything preventing a
seal from forming between your
face and the mask.
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