This report describes experiments conducted by CDC to assess two ways of improving the fit of medical procedure masks.
Making masks fit better can reduce coronavirus exposure by 96 percent
Masks and Respirators
Federal Register :: COVID-19 Vaccination and Testing; Emergency
How to Wear and Care for Face Masks
3D Printed frames to enable reuse and improve the fit of N95 and KN95 respirators, BMC Biomedical Engineering
Filtration Performance of Layering Masks and Face Coverings and the Reusability of Cotton Masks after Repeated Washing and Drying - Aerosol and Air Quality Research
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How Effective Is a Face Mask Against COVID-19 if You're the Only One Wearing It?
Epidemiologia, Free Full-Text
CDC: Double Masking Can Reduce COVID-19 Spread by up to 96.4%
COVID-19 mask use: How to make your mask fit properly
