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Apr 15, 2020 · N95 Test Material #1 (Particulate respirator, 3M N95 8200/07023) 1 layer: 100: Room air purifier filter #1 (3M Filtrete 1900, MERV 13) 4 layers: 100: Room air purifier filter #2, (3M Filtrete Premium Allergen and Ultrafine Particles, D Filter Size, True HEPA, Model #1150099) 1 layer: 100COVID-19 Mask Materials - Texas A&M UniversityApr 15, 2020 · N95 Test Material #1 (Particulate respirator, 3M N95 8200/07023) 1 layer: 100: Room air purifier filter #1 (3M Filtrete 1900, MERV 13) 4 layers: 100: Room air purifier filter #2, (3M Filtrete Premium Allergen and Ultrafine Particles, D Filter Size, True HEPA, Model #1150099) 1 layer: 100COMMENTARY: Masks-for-all for COVID-19 not based on Following a recommendation that cloth masks be explored for use in healthcare settings during the next influenza pandemic, 3 The National Institute for Occupational Safety and Health (NIOSH) conducted a study of the filter performance on clothing materials and articles, including commercial cloth masks marketed for air pollution and allergens 4 layer air filter masks anti sars from china

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