How long can various masks be worn?

Q: How long can various masks be worn?
A: KN95 masks are recommended to be replaced every 8-10 hours. Disposable medical masks and medical surgical masks should not be used for more than 4 hours. (If there is moisture in the mask or the mask meets water, please replace it in time, because the static electricity in the electrostatic melt-blown cloth is invalid and reduced. Security).

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