40mm NATO reuseable gas mask filter
thingiverse
Reusable filter for your surplus gas mask! whether you're spray painting in you garage, trudging through ash after a Yellowstone eruption, or fighting mutagenic zombies in a post apocalyptic wasteland, you control the filter element based on your needs and material availability. -40mm NATO threads -accepts filters up to 3.5" (89mm) diameter X 3/8" (9.5mm) thick -1/4x20 stainless steel bolt and wing nut to connect halves (screw your superior metric hogwash...USA!) -coffee filters, cut up respirators, and air filters could all make effective particulate filter elements. WARNING: This model has no brain, USE YOUR OWN! Not intended to protect against chemicals, please reference OSHA respirator regulations before attempting to use. https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.134
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