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Compared with long medical surgical masks and ordinary medical masks, medical protective masks have a good fit with the wearers face, can filter particles in the air, and block pollutants such as droplets, blood, body fluids and secretions The filtration efficiency
Dec 20, 2019 · In this case, its basically just a percentage. 95 rated masks can filter out 95% of particulate matter. For things like rough construction dust and debris, this is generally fine. Likewise, its good for short term use, but longer term use still leaves quite a bit of exposure to potentially dangerous particulate matter.
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A surgical mask could be used for a whole day in a good condition of no damage, no moisture, and no deformation. According to some researches, the N95 respirator mask used for two days still maintains a filtration efficiency of at least 95%, while the filtration efficiency of an N95 respirator used for three days reduced to 94.7%.
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Jul 25, 2008 · How long can one use a disposable personal respiratory protection (masks) By Michael Rich, MD MPH 25 Jul, 2008 . Can we recommend to facilities in resource poor areas that disposable respirators (masks) be used as long as they are in good condition, including the seal intact?
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