Do N95 and KN95 masks with breathing valves have any effect on anti-virus? _ Protection
Original title: Are N95 and KN95 masks with breathing valves effective in preventing viruses? N95/KN95 respirator is divided into respirator with breathing valve and respirator without breathing valve. As long as it is a qualified product, the protective effect of a mask with the same level of protection is the same whether it is equipped with a breathing valve or not. The difference between...
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