OSHA doesn’t require a physical, but it does require a fit test to insure that the mask is doing its intended purpose.
My wife made us a few home-made masks early in the quarantine. I found that the n95 masks were easier to breath through than the home-made ones she made. N95’s are rather tight and leave a mark on your face. And I had to shave off my beard
n95 masks are designed to protect the user from contaminated virus-laden air, filtering ~95% of airborne virus particles.
Surgical masks are designed to protect those around the person wearing it by trapping aerosolized particles within the mask. They don’t effectively protect from aerosolized virus particles.
Too many people do not wear their masks properly. I see so many people wearing their masks only over their mouth... or even just hanging around their neck
I know others will reuse their masks over and over again.
OSHA general guidelines call for single use of masks.
During this crisis they have relaxed their standards and allow multiple use.
Virus particles can remain viable on masks for up to five days.
Wash all home-made masks in hot water after each use.
I am required to use an n95 mask at work and to use it 3 times before disposing of it. We use it one day, then paper bag it for a week: then once again on week 2 and again on week 3, before tossing it.
My feeling is that using a mask more than once is like reusing toilet paper. YUCK!
I wash my home-made mask every day with the clothes I go to work in. Shoes get left outside. Scrubs and travel clothes, with the mask get washed immediately upon getting home. Then I take a second shower.
Rob