40mm NATO reuseable gas mask filter
Description
*****NEW AND IMPROVED VERSION AVAILABLE, CHECK IT OUT!***** https://www.thingiverse.com/thing:4773016 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 2.75" (70mm) diameter X 3/8" (9.5mm) thick -1/4x20 (M6) stainless steel bolt and wing nut to connect halves -coffee filters, cut up respirators, and air filters could all make effective particulate filter elements. -4² inches of breathable surface area -Modeled in English, scale up by 2540% to print in metric 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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