Most disposable masks are heat magnets. When you breathe out, you release huge amounts of warm air into a confined space. In order to minimize the amount of trapped warm, moist air, simply cut a slit in your mask slide the vent into the hole and then place to front ring on the opposite side to hold it in place.
For use on almost any mask. NOT APPROVED BY ANY MEDICAL ORGANIZATION. USE AT YOUR OWN RISK.
I have to say that, but really, I use this product on my mask.
Designed by OBJ Prints