Function and purpose
The filtering efficiency of the N95 mask for particles with an aerodynamic diameter ≥0.3µm is above 95%. The aerodynamic diameter of air bacteria and fungal spores mainly varies between 0.7-10µm, which is also within the protection range of N95 masks. Therefore, the N95 mask can be used for respiratory protection of certain particles, such as dust generated by grinding, cleaning and handling minerals, flour and some other materials. It is also suitable for liquid or non-oily generated by spraying. It can effectively filter and purify the inhaled abnormal odors (except toxic gases), help reduce the exposure level of some inhalable microbial particulates (such as mold, anthrax, tuberculosis, etc.), but it does not eliminate the risk of contact infection, disease or death. It can also be used to wear on the mouth and nose of the medical staff in the operating room to prevent the spread of scurf and respiratory tract microorganisms to the open surgical wounds, and prevent the spread of the body fluids of the surgical patients to the medical staff, playing a two-way biological protection role.