I address that in the general comments section. Exhalation valves do make n95s worse at source control compared with n95s without a valve. However an n95 with a valve is still about as good at protecting people around you as a cloth mask or surgical mask.
Excellent write-up. Though, I think it’s important to note that, if unfiltered, exhalation values can potentially spread disease.
I address that in the general comments section. Exhalation valves do make n95s worse at source control compared with n95s without a valve. However an n95 with a valve is still about as good at protecting people around you as a cloth mask or surgical mask.