Heres a pdf file for download of a mask pattern by a company that is a " Sew Shop" called Suay.
They say they even tested it but I didn't see any results listed.
DISCLAIMER *This mask pattern is optimized for production, developed for a universal adult fit. There is an optional variation to the pattern (see below). These materials are just suggestions, as we have only been able to do particulate testing as included. Even so, our testing results are not guaranteed, and this mask pattern is not approved by the FDA or CDC, and these filter options have not been approved for mask making materials. We encourage you to stay curious and only use what you feel comfortable with, and always follow the guidance of the CDC available here. We’re making this pattern available in order to contribute to the public good. We don’t want to be sued because of it. By accessing and/or using this document and the content it contains, you agree to the following terms:
https://cdn.shopify.com/s/files/1/0050/2474/3524/files/Suay_Mask_Pattern_2020.pdf?v=1586309614
Just thought I'd post an alternative mask for folks to have on file
They say they even tested it but I didn't see any results listed.
DISCLAIMER *This mask pattern is optimized for production, developed for a universal adult fit. There is an optional variation to the pattern (see below). These materials are just suggestions, as we have only been able to do particulate testing as included. Even so, our testing results are not guaranteed, and this mask pattern is not approved by the FDA or CDC, and these filter options have not been approved for mask making materials. We encourage you to stay curious and only use what you feel comfortable with, and always follow the guidance of the CDC available here. We’re making this pattern available in order to contribute to the public good. We don’t want to be sued because of it. By accessing and/or using this document and the content it contains, you agree to the following terms:
https://cdn.shopify.com/s/files/1/0050/2474/3524/files/Suay_Mask_Pattern_2020.pdf?v=1586309614
Just thought I'd post an alternative mask for folks to have on file