Disposable medical protective mask with CE / FDA certificate
General medical masks can be worn for 2-4 hours. Under normal circumstances, if you wear it for more than four hours for a long time, a large amount of particles in the ventilation will be adsorbed on the outside of the mask, thus blocking the gap of the mask filter material will not only reduce the filtering effect of the mouth, but also increase the respiratory resistance Yichang has an effect on the human nasal mucosa, reducing the original physiological function of the nasal cavity. It is recommended that when wearing a medical mask, you must master the time and replace it in time.