N95s have an expiration check valve. They're banned in most serious contexts for that but even where they aren't, if you're looking to protect others as well as yourself, you should use a KN95.
edit - at least the ones they usually have at hardware stores
N95s have an expiration check valve. They're banned in most serious contexts for that but even where they aren't, if you're looking to protect others as well as yourself, you should use a KN95.
edit - at least the ones they usually have at hardware stores
deleted by creator
I mean you can buy them without the valve. N95 is just a filtration standard. Most n95s don't have an exhalation valve.