This gets mentioned every once in a while, so I'm just noting this here for when we have a full mask to test and evaluate whether an inner mask wall valve and/or inhale valve would help reduce fogging or improve the co2 situation.
Issue #5 has pictures of a commercial mask that seems to lack an inner mask valve.
This gets mentioned every once in a while, so I'm just noting this here for when we have a full mask to test and evaluate whether an inner mask wall valve and/or inhale valve would help reduce fogging or improve the co2 situation.
Issue #5 has pictures of a commercial mask that seems to lack an inner mask valve.