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it should be ....
easy way to tell , do ya have dust on your nose hairs when ya take it off ???
if so it's not working ..
the double canister doesn't work with a beard ...
it does seal better than just the white paper ones ..
since i have a beard and asthma and a chitload of other 'allergies ' this is what i have to use ..
it's a pain in the butt ....
but it's what i have to do
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