3 ms·

Don't fly AA then, respirators have a vent.

• giantg2 6y ago
  It's fine, you just need to put cloth over the vent to meet their requirements.
  • mindslight 6y ago
    If it's like my 3M mask, you should be able to take the face piece apart, pull off the check valve flaps, and seal the vent port. Cleaner job, no worries about the vent retaining moisture, and P100 output filtration. It does retain a bit more warmth, but after a few months of wearing it modded I've stopped noticing.