Respirator Ratings N95, FFP2, KF94 And More » Breathe
Mar 05, 2020 · Respirator Rating Systems. The biggest factor that makes understanding respirator ratings so difficult is the number of different systems. The most commonly known respirator rating is the NIOSH system, which rates masks as N95, N99, and N100. These masks are rated by the American National Institute for Occupational Safety and health, which is part of the CDC.