Covid-19 Mask with changeable filter unit
Description
Mask with changeable filter unit and good air flow. I used vacuum cleaner bag 3-layer synthetic material sprayed with Carbon nano spray very time i use it. Dimension of plain filter canvas is 77×177 mm. You can also add extra filter layer. Its important to varnish the surface with a spray paint. Use PET or ABS material to be able desinfect mask & filters units without melting them :-) ToDo: One more wave for air flow improvement.
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