3M also make N95 masks without an exhale valve - you should get those instead, the ones with valves are perfectly fine for situations like a non-infected very vulnerable person, but when trying to limit the spread of coronavirus they're basically selfish and less useful, as they don't protect anyone except you.
(Though I must admit, having accidentally bought a few of the valved ones early on in the pandemic, I found that the exhale valve actually meant my warm breath didn't heat the mask & my face quite as much, which was really nice for me as I suffer from hyperhidrosis - excessive facial sweating - but I stuck with using non-valved masks since I'm much less at risk than various friends and family members are.)
(Though I must admit, having accidentally bought a few of the valved ones early on in the pandemic, I found that the exhale valve actually meant my warm breath didn't heat the mask & my face quite as much, which was really nice for me as I suffer from hyperhidrosis - excessive facial sweating - but I stuck with using non-valved masks since I'm much less at risk than various friends and family members are.)