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Medical masks exhibited 55% efficiency, general masks 38% and handkerchiefs 2% (one layer) to 13% (four layers). These studies demonstrate that cloth or homemade masks will have very low filter efficiency (2% to 38%).
May 03, 2020 · What I find interesting about the best face mask for flu is its 4 layer particle filtration design. One of these layers has electrostatic properties that are ideal for trapping charged particles in the air. FWPP also says that the face mask can filter up to 90 percent of airborne particles.
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Medical masks exhibited 55% efficiency, general masks 38% and handkerchiefs 2% (one layer) to 13% (four layers). These studies demonstrate that cloth or homemade masks will have very low filter efficiency (2% to 38%).
4 layer face mask (4 layers, not to be mistaken for 4 pleats) Washable Cotton Adult Size Colors may vary from what is in the photo and is a random selection process. This is my own design of 4 layers. Be careful of the click bait that pulls 4 layers in your search but they aren't truly 4 layers. Be assured that these are. 100% Cotton and polyester
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