How often do I need to change the masks?

        The mask changing frequency is a personal preference. The mask could be sanitized with

UV or air blow dryer, and it could be recycled. Our filtration is provided mainly through HEPA filters not through mask. The mask works as a confinement of breathing zone. Also you are not obligated to use our masks. You could use any masks

with FitAir as long as you cut a hole size that will work with our fixture.