Unlike masks, respirators protect precisely those who wear them. Respirators clean the air that a person inhales of particles of 0.04-1.3 microns. Since the sizes of almost all microbes (including the 2019-nCoV Chinese Coronavirus, particles of 0.08-0.09 microns in size) fit into this interval, hospital staff wear respirators for protection during epidemics. Respirators are made of filter material, they fit snugly to the face, covering the nose, mouth and chin, and are attached to the nape with straps. In some models of masks, an inspiratory and expiratory filter is built in. But such models protect only the one who wears them, while others will inhale the infected air if the person is sick. Therefore, today the optimal protection solution is the KN95 Respirator