The aerodynamic diameter of N95 mask is 0.075? m 0.02？ The filtration efficiency of M particles is above 95%. Air-modified bacteria and fungal spores are also within the protection range of N95 mask.
Therefore, N95 mask can be used for respiratory protection of some particles, as well as liquid or non-oily particles produced by spraying, which helps to reduce the exposure level of some inhalable microbial particles, but it cannot eliminate the risk of contact infection, illness or death.
surgical mask
Precautions:
KN95 door cover comes from Chinese national standard GB2626-2006 "Breathing protective articles self-priming filter type anti-particulate respirator", where n stands for non-oil resistance and can be used to protect non-oil suspended particulate matter. 95 indicates that the filtration efficiency is greater than or equal to 95%.
KN95 means that the filtration performance of non-oily particles can reach more than 95%, which can provide better protection in daily life and has higher filtration efficiency.
KN95 mask is used in non-medical places to prevent various aerosol particles suspended in the air, including dust, smoke, bacteria, viruses and other pathogenic microorganisms.
There are two main types of KN95 interface: breathing valve and non-breathing valve. Among them, the mask without exhalation valve can effectively prevent the droplet bacteria discharged by the wearer from polluting the surrounding environment, while the mask with exhalation valve does not have this function.
Baidu Encyclopedia -KN95 Mask