N95 or N99 Mask? - Coronavirus COVID-19 Discussion Forum
May 18, 2006·The number on the mask is the sise of particles it will block. N99 is therefore better than N95 Nanomasks to my knowledge are not OSCHA tested therefore your buying something trusting the manufacture to tell the truth. Masks do work N95 masks were used during the SARS outbreak and shown to be effective.