I notice that that mask has an exhaust valve, which means it filters air only on the way in, not on the way out. But I understand that a large part of the reason for wearing a mask is to protect other people from you, and an exhaust valve defeats that.
I don’t have an answer, but maybe you can reach out to the people at MUSC who designed this: https://web.musc.edu/innovation/covid-19-innovation
I notice that that mask has an exhaust valve, which means it filters air only on the way in, not on the way out. But I understand that a large part of the reason for wearing a mask is to protect other people from you, and an exhaust valve defeats that.
Agreed.
I’m just hoping that that they can give the OP some information about using HEPA filters.
I’ve noticed that many N95 masks also have an exhaust valve.