EVO II breathing mask - respirator with non-return valves and replaceable P3 nanofilters
grabcad
The second evolution of the anatomical breathing mask. Check valves are made of polycarbonate by laser or water. The required DWG file is attached. Silicone casting is also possible. Adjusting the "face part" exactly to your face is possible using the ReCap Photo tool or similar. It is not a difficult operation. Everything else is made by 3d printing. Interchangeable certified P3 nanofilters, manufactured by Workpress Aviation, can be purchased here https://www.wparespirators.cz/
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