Here's what we found out about reusable N95 masks from our research and experts in the field. Free N95 masks N95 masks free from gov the N95 mask, also known as an organic vapor respirator ( OVR ) , is a face-piece that you can use to help protect yourself against breathing in airborne chemical, biological, radiological and nuclear ( CBRN ) materials. KN95 KN95 N95 mask difference doctors, nurses, and other healthcare professionals may come into contact with patients who are sick with infectious diseases like tuberculosis or the flu. Clearly, there is a problem. If your mask is also little, air will not move appropriately via it as well as you will not obtain appropriate defense from contaminants as well as bacteria. If you're wondering whether or not your old mask is still good, read on!