Can KN95 masks be used repeatedly?

The new coronavirus pneumonia is the absolute hot spot of this Spring Festival.KN95 face mask Masks have become a must-have for everyone, and there have been endless statements about masks: Some people say that masks have to be shredded, others say they need to be hot-hot;KN95 face mask others say that masks should be as thick as possible, while others say wear more Several layers are more effective; KN95 face mask some people say that the masks should be replaced when they are worn, and some people say that they can’t be taken off even if they are worn;KN95 face mask you may be confused when faced with various messy information.

Recently,KN95 face mask experts suggested that masks should be avoided from repeated use. Because viruses or pathogens can accumulate locally on the vent valve,KN95 face mask try not to choose a mask with a vent valve. If you want to completely avoid coronavirus infection, wear a N95 mask. It is recommended that N95 masks-wear for no more than 4 hours. Some researchers have conducted research on the protection efficiency and wearing time of N95 medical protective masks. The results show that the filtration efficiency of N95 masks is still above 95% for 2 days,KN95 face mask and the respiratory resistance. The force does not change much; the filtration efficiency decreases after 3 days of wearing To 94.7%.

The recommendation given by the US CDC is that in the absence of sufficient supplies of masks, as long as the device is not significantly soiled or damaged (such as creases or tears),KN95 face mask it can be considered for reuse. The design of the exhalation valve is very delicate, with several layers of flaps. During inhalation,KN95 face mask the flap will close tightly to ensure that no particles enter. When exhaling, the flap will open, allowing the hot and humid air to escape. At the same time,KN95 face mask there is also a layer of soft flaps to ensure that no small particles enter.

In the past two days, there have been many misunderstandings about the N95 with an exhalation valve. Some people think that the exhalation valve has no protection.KN95 face mask A study published in 2008 specifically investigated whether the exhalation valve would affect the protection of the wearer. The conclusion is whether the exhalation valve does not affect the respiratory protection of the wearer. Simply put, the N95 with an exhalation valve can protect the wearer,KN95 face mask but not the people around it. If you are a virus carrier, please choose N95 without exhalation valve, do not spread the virus. If you want to maintain a sterile environment, you can not use N95 with an exhalation valve, KN95 face mask because the wearer may exhale bacteria or viruses.