The KN90 mask shows that it can block about 90% of pathogenic bacteria and particles from the outside, and its permeability is good. Although it is not the best type of mask to prevent novel coronavirus, it can also play a preventive role. Therefore, in the case of mask shortage, it can also be prevented by wearing KN90 mask. However, if you want to get the effect of maximum probability prevention, it is best to stay at home and don't go out to contact outsiders.
Second, what masks can prevent coronavirus?
1.KN95 mask
Medical KN95 mask can be used to prevent novel coronavirus, which can effectively block more than 95% of particulate matter and various pathogenic bacteria. Although this kind of mask has high filtration efficiency, its air permeability will be poor, so pay attention to the breathing situation when wearing it. However, ordinary people don't have to wear this mask when they go out. They are more suitable for front-line doctors and nurses.
2.3 m mask
You can wear a 3M mask when you go out, which will help prevent you from being infected by novel coronavirus. This kind of mask often has an additional function, that is, the patented cold flow exhalation valve helps to breathe smoothly, and it is made of polypropylene, which can meet the filtering needs while maintaining a low respiratory resistance.
3. Medical surgical masks
Medical surgical masks can effectively block the invasion of novel coronavirus and other pathogenic bacteria. This mask is divided into three layers: comfort layer, waterproof layer and filter layer. When wearing, the waterproof layer should be on the outermost layer, so as to achieve the highest protective effect. However, masks are generally disposable and need to be disinfected and discarded immediately after going out. Can not be reused, and it should not be worn for too long every day.