Modular snorkel mask to HEPA filter adapter with anti-backflow valve

thingiverse

This potentially hazardous DIY Personal Protective Equipment is a Frankenstein's monster of a creation, its effectiveness hanging precariously in the balance of quality fabrication, meticulous assembly, a snug fit of the mask, and optimal performance of the filter. Even with flawless parts and precision assembly, it may not function as intended for any purpose. This design draws inspiration from the work of the National Institutes of Health, adapting a ubiquitous snorkel mask to a filter size of 4.3 inches long by 2.7 wide by 0.82 inches thick. It should be dimensionally compatible with Kenmore EF-2 86880, Sears Kenmore Part # 20-86880 (86880), 40320, EF2, 610445, Panasonic MC-V194H filters. I have no information on the performance of any of these filters; I simply copied and pasted a compatibility list. Many manufacturers produce identical masks to the one used for this design. A reference can be found here: https://www.amazon.com/BUGU-Anti-Leak-Panoramic-Experience-Snorkeling/dp/B07BXZQY8G/ The filter housing has been designed to be modular, easily replaceable. The adapter/valve housing is separate from the filter housing, allowing for different filter housings to be designed for interchangeability. Crucially, this design features an anti-backflow valve (printed from Ninjaflex in this prototype) to ensure a positive through-flow of fresh air and prevent moisture from compromising the filter. Without it, users would breathe a high volume of stale air due to the deadspace in the mask, leading to an out-of-breath feeling and heavier breathing. All joints must be sealed. The adapter body must be glued/sealed to the filter housing. Provision for mechanical fasteners has been made for added strength only. The filter cover is designed to be surrounded by a closed-cell foam rubber gasket, sealing to the filter housing and also to the perimeter of the HEPA filter itself. The filter should be inserted with its gasket side inward. The valve flap needs to be popped into place; its tab gets inserted into the small slot in the interior of the valve barrel. A blunt object, such as a pen, can be helpful here. Be cautious. Print with the flat sides of the filter box and lid down. Print the valve body in the orientation given. No supports should be needed. This device should only be used when no more reliable option is available.