Quote Originally Posted by TheTravellers View Post
Do regular (not HEPA) HVAC (commercial or residential) units have filtering that will actually grab and trap virus particles? And do we even know for certain how contagious airborne coronavirus is or if it's transmitted primarily by touch or droplets/aerosol, or how much viral load has to be ingested before someone gets sick?
They would catch some percentage. Most commercial units would have MERV 8 or MERV 11 filters. If my understanding of N ratings of masks is right an 8 would be about the same as an N45 mask and 11 would be about the same as an N65.