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The filtration efficiency was 74% for a 2-layer woven nylon mask with ear loops (easy masks llc) with an aluminum nose bridge and nonwoven filter insert which, interestingly, had a slightly higher filtration efficiency after being washed once, 49.9% for a folded, cotton bandana, 39.3% for a single-layer woven polyester/nylon mask with ties ...

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Apr 19, 2020 · lexbreezy hawaii has a “buy a mask, give a mask” campaign. the masks for sale include various tropical prints for $15 made out of a cotton …

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