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
3M N95 masks. Can get them at hardware stores.
Not the most comfortable but safety >>>>> comfort.
To check if you have a good seal, take a deep breath and you should feel the inner layers of the mask being "sucked in" if that makes sense.
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.