40mm NATO reuseable gas mask filter
thingiverse
Reusable Filter for Gas Masks on Demand - Upgrade Your Protection Anytime. Whether you're painting in your garage, walking through ash after a Yellowstone eruption, or fighting zombies in a post-apocalyptic wasteland, 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 - A 1/4x20 stainless steel bolt and wing nut connect the halves (forget metric, USA all the way) - Coffee filters, cut respirators, and air filters can be used as effective particulate filter elements. WARNING: This model has no brain; USE YOUR OWN! Not designed to protect against chemicals - please consult OSHA's respirator regulations before using. Check out osha.gov/laws-regs/regulations/standardnumber/1910/1910.134 for more information.
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