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If your c-pap face mask is leaking you may need a replacement mask.
The c2 Series canister
Subnet mask.
The C2 Series canister.
The Primary Filters
C2 Series
c2 canister
Test for a tight fit with the M50 gas mask as follows: With a hand over the front module assembly, blow out hard to force out any air around the edges of the mask. With the palm of your hands, cover both primary filter inlet ports and breathe in. The mask should collapse against your face and remain so while you hold your breath. If it does the mask is airtight. If the mask does not collapse, check for leaks. If the mask still does not collapse, notify your superior.
the C2 Series canister
An N95 or similar mask will filter viruses (H1N1 included) But its not the micron filtration size that needs to be focused on, its the proper fit of the mask. Leaks from improper fit and deep breaths will severely limit the effectiveness of simple filter masks. The other consideration is behavior while masked. Wiping the eyes, picking your teeth under the mask, etc.
the C2 Series canister The primary filters
primary filters or... The C2 Series Canister