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This model is designed for 3D printing and allows for the attachment of a filter to the front of the mask. The filter that fits this mask is a 3M F2 Dirt Devil HEPA Filter.
This model is still in review from the NIH and it is not recommended that this be mass produced or widely used without clinical trials first.
https://grabcad.com/library/covid-19-f2-hepa-filter-mask-v3-1
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