GOST 8762-75 adapter for surgical mask filter
thingiverse
One of the recommended masks to replace surgical masks is the Montana Mask https://www.makethemasks.com/about-the-mask The idea is to use surgical filters multiple times by cutting it to pieces. This design will allow you to use the filter on pre-existing masks with GOST 8762-75 sockets. It uses the same filter frame. To insert the tissue, cut a piece slightly larger than the filter frame. Pit it on either side, verify that it points into the right direction (just to be sure) and push the frame into the socket. See also: https://www.thingiverse.com/thing:4259580 SnorkPPE Aspiria version - Snorkel Mask Adapter Design files: https://www.thingiverse.com/thing:4281073
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