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Respirator is a kind of sanitary product, generally refers to a device that is worn on the nose and mouth to filter the air entering the nose and mouth, so as to block harmful gases, odors, and droplets from entering and exiting the wearer's mouth and nose. It is made of gauze or paper. Masks have a certain filtering effect on the air entering the lungs. When respiratory infectious diseases are prevalent and when working in a polluted environment such as dust, wearing a mask has a very good effect. Masks can be divided into air filter masks and air supply masks.