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4 . How to Use Respirators. 5 . Comfort Considerations. 6 . Other Questions Surgical gauze masks or uncertified dust masks typically do not have Surgical masks are not necessarily designed to seal tightly to the face so air might leak Some FFRs are available with a carbon layer that will provide relief against low

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2 Mar 2020 Surgical face masks and N95 respirators which filter viruses from the air they become trapped in the mask layers and by ionically binding to pressure change between the air inside and the outside atmosphere. or a dust or allergy mask is chosen and worn into a highrisk area. 2 middot 3 middot 4 middot 5 middot 6 middot 7 middot 8.

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