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Amazon.com: surgical mask

KN95 Face Mask 20Pcs, Included on FDA EUA List, 5 Layer Design Cup Dust Safety Masks, Breathable Protection Masks Against PM2.5 Dust Bulk for Adult, Men, Women, Indoor, Outdoor Use, Black

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(PDF) Testing the Efficacy of Homemade Masks: Would They ...

Barrier face mask 4239, EN14683 class I), for compa rison. ... had filtration rate between 49% to 86% for 0.02 μm exhaled particles while surgical masks filtered 89% of those type particles ...

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Amazon.com: surgical mask

KN95 Face Mask 20Pcs, Included on FDA EUA List, 5 Layer Design Cup Dust Safety Masks, Breathable Protection Masks Against PM2.5 Dust Bulk for Adult, Men, Women, Indoor, Outdoor Use, Black

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