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Feb 25, 2020 · N95 respirators can usually be used until the filter gets clogged up which is noticeable when it gets harder to breath. However when radioactive particles and biological agents are involved a one time use is advised for any filter. However in our

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Coronavirus fears stoke face mask hoarding. Here's what

The new coronavirus from Wuhan is in 25 countries, including China. And N95 masks filter out 95 percent of particles in the air that are 0.3 microns in size or larger. says Annelies Wilder

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The Association of Perioperative Registered Nurses suggests that surgical masks should filter bacteria at least 0.3 µm in size for regular use and 0.1 µm in size for use in laser surgery, or they should provide 90 percent to 95 percent bacterial filtration efficiency (AORN, 2005).

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