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An official website of the United States government
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock () or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
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This face mask design can accomodate variations in filter thickness to allow available materials to be used. It incorpoates anti-rotation features to ensure the filter material is properly seated and sealed in the mask. The anti-rotation avoids bunching of the filter material as the threaded cover is secured to the mask.
