threaded filter mask
thingiverse
This mask features a sturdy 48mm threaded stub designed to securely hold high-quality filter material cut from vacuum cleaner bags, specifically those measuring at least 44mm in diameter and no less than 8mm thick.\r\nTo effectively prevent the spread of coronavirus, it's crucial to select a filter that meets or exceeds rigorous standards, such as FFP3-grade material or vacuum cleaner bag filters capable of capturing microparticles down to .03µm in size, comparable to those found in sneeze droplets.
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