Aren’t those less effective at protecting other people than using a mask without a valve?
Yes. On the other hand they have less condensation, are easier to breathe in, and are generally much easier to find in higher protection factors (I’m not aware of any valveless 99%+ efficacy masks)
Yes. On the other hand they have less condensation, are easier to breathe in, and are generally much easier to find in higher protection factors (I’m not aware of any valveless 99%+ efficacy masks)