KN95 grade masks are able to prevent virus inhalation. KN95 masks are designed to protect against particles below 5um in accordance with the relevant Chinese standards, and their filtration function can reach 95%, i.e. 95% of particles can be effectively blocked. This kind of mask has a better protection function and the filtration efficiency can reach 95%, which is often used in the prevention of viral infectious diseases in the respiratory system. By using this kind of mask can effectively block the virus into the respiratory tract, especially when the recent outbreak of epidemic new coronavirus infection, this kind of mask is effective in preventing the new coronavirus and virus containing droplets inhalation. However, the level of protection of this mask is better, usually used in hospital fever clinics and medical staff working in the infection department, it is not recommended to wear in daily life, usually choose medical surgical masks, N90 masks that can. Note also that you cannot use cotton gauze masks, sponge masks, activated carbon masks, etc., because such ordinary masks cannot prevent the inhalation of viruses.