[Chauncey Gardiner]

If the material is doubled up, perhaps a pocket can be created to insert the paper element from a HVAC filter (Filtrete HVAC filters - purple - for viruses).

[Boomer]

If the material is doubled up, perhaps a pocket can be created to insert the paper element from a HVAC filter (Filtrete HVAC filters - purple - for viruses).

Like this?

Or this?

Seriously; more layers will help. I'm just not sure stopping this virus is even possible. It wasn't with the H1N1. That virus ended when it had run its course when no one in America did anything like wearing masks.

I do think people like to think they are doing 'something'.