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.
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.
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.
