Protective Non-medical Face Masks KN95/PPE

KN95 Respirator masks are rated to filter 95% of particles. In April of 2020, in order to help expand the availability of general use face masks for the general public and particulate filtering facepiece respirators for healthcare professionals during the COVID-19 pandemic, the FDA issued guidance authorizing the use of KN95 masks.
On May 7th of 2020, the FDA updated the April guidance and issued further guidance limiting the use of certain KN95 masks as suitable NIOSH alternatives in a healthcare setting.