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The filtration efficiency and protective ability of a face mask is compromised when the mask becomes wet, torn or dislodged. Generally speaking, the higher protection value of a mask the longer it will maintain filtration; however, there is no set rule for how long a mask should be worn as it depends on humidity levels, respiration rate, nasal discharge, talking, etc.

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Mar 07, 2020 Compared with medical surgical masks, N95 masks are better closed. When choosing an N95 mask, try to choose an N95 mask without a breathing valve. Because the patient wears a mask with a breathing valve, it is equivalent to directly transmitting the germs to the surrounding people, without blocking the germs of the patients.

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Try on the first surgical mask you make to ensure youre on the right track. Make adjustments to the length of elastic for a tighter or looser fit. This is also an opportunity to see how the mask looks in use. If the elastic pulls the mask too close to your eyes, trim the next mask a

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The left most mask is a 3M N95 mask, the N95 mask2 is a Moldex N95, and the right most mask is a cheap surgical mask bought from a street vendor in Kathmandu. The surgical mask blocked about 60% of .03 micron particles and over 90% of 1 micron and 2.5 micron particles.

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