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You should be able to breathe out through your nose and have no effect on the seating of the mask -- that's what rebreather divers do all the time. If you can't do this, it has to be a problem of...
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You should be able to breathe out through your nose and have no effect on the seating of the mask -- that's what rebreather divers do all the time. If you can't do this, it has to be a problem of...