The new type of coronavirus pneumonia is the absolute hotspot of this Spring Festival. Masks have become a must-have item for everyone, and there are endless talks about 'masks': Some people say that masks should be cut when they are taken off, and others say that they need to be scalded with hot water; Some people say that masks should be thicker, the better, others say It is more effective to wear a few more layers; Some people say that you have to change the copper mask
if you wear it, and some people say that you can’t take it off if you wear it straight; In the face of all kinds of messy information, you may be confused. Recently, Wang Yuedan, professor of immunology at Peking University, suggested that masks should be avoided repeatedly. Because viruses or pathogens will accumulate locally in the vent valve, try not to choose a mask with a vent valve. If you want to completely avoid coronavirus infection, you should wear an N95 copper mask. It is recommended that N95 masks be worn for no more than 4 hours at a time. Some researchers have done related research on the protection efficiency and wearing time of N95 medical protective masks. The results show that the filtration efficiency of N95 masks remains above 95% when worn for 2 days, and the respiratory resistance and force change little; the filtration efficiency is reduced after wearing for 3 days. To 94.7%. The US CDC’s recommendation is that if there is no sufficient supply of masks, as long as the equipment is not obviously soiled or damaged (such as creases or tears), it can be considered for reuse. The exhalation valve is very delicate in design, with several layers of flaps. When inhaling, the mouth cap will close tightly to ensure that no particles enter. When you exhale, the flap will open, letting out the hot and humid air. At the same time, there is a soft flap inside to ensure that no small particles enter. In the past two days, everyone has a lot of misunderstandings about the N95 which has an exhalation valve. Some people think that if there is an exhalation valve, there is no protection. A study published in 2008 specifically investigated whether the exhalation valve affects the protection of the wearer. The conclusion is that- whether there is an exhalation valve or not does not affect the respiratory protection of the wearer. Simply put, N95 with an exhalation valve can protect the wearer, but not the people around it. If you are a virus carrier, please use N95 without an exhalation valve and do not spread the virus. If you want to maintain a sterile environment, you cannot use N95 with an exhalation valve, because the wearer may exhale bacteria or viruses. 334
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