Breathing valve masks are designed for people’s health and can filter the air from visible or invisible substances that are harmful to the human body so that they do not adversely affect the human body.
It is important to note that masks with breathing valves can filter the air that is inhaled, but not the air that is exhaled. Therefore, for the general population, a mask with a breathing valve can be worn and can protect the wearer. In the case of newly crowned pneumonia patients, suspected infected persons and close contacts during the incubation period, masks with breathing valves should not be worn because the breathing valves do not block the spread of droplets from the wearer to the environment and may cause the spread of the virus.