MEDICAL MASK FOR PUBLIC USE
Currently, in connection with the development of coronavirus infection, personal protective equipment is becoming increasingly important. Respiratory protection masks used in medical practice are primarily intended to protect patients during surgery and medical examinations. Industrial masks are known from the prior art for performing all kinds of hazardous work, such as spray painting, carpentry and milling work. They are distinguished by a large layer of absorbing material, which facilitates the absorption of suspended solids from the inhaled air. Almost all of these masks are equipped with a unidirectional valve that allows free exhalation without filtering the exhaled air volume. Thus, it is undesirable to use industrial masks for medical purposes. However, with intensive wearing of the mask, it is advisable to use a reinforced absorbing layer, in contrast to manufactured medical masks. This raises the problem of difficulty in exhaling, which leads to unnecessary fatigue and sweating of the user - which is undesirable in public places. The solution proposed in the article facilitates the exhalation process while maintaining enhanced inhalation filtration. This is achieved by introducing a double filter, where one filter is made of a thicker layer of material and is equipped with an exhalation valve, the second layer is made thinner and equipped with an inhalation valve.