A ventilator is a device used to maintain artificial respiration or to circulate fresh air, and it is a breathing mask that is used to protect the user from particles in the air. A device that covers the entire nose, mouth, face or head to protect the user from dangerous weather factors. Respirators can be: narrow, that is, semi-masks that cover the mouth and nose, and full-face masks that cover the face from the hairline to the lower part of the chin. Respirators protect against exposure to airborne particles. It protects against exposure to biological aerosols, including viruses and bacteria. Surgical masks provide a barrier against stains, drips and saliva. The fans are designed to close tightly to the user's face.