HEPA box for Westinghouse SP-6440HP, and other modified parts

thingiverse

Made to fit the smallest HEPA filter I could find nearby. Walmart sells a Westinghouse NCCO HEPA filter that measures 11.61cm x 13.59cm x 0.89cm, model # SP-6440HP. It looks huge and crazy, but it's very easy to breathe through. I modified this to fit the "COVID MASK" by Joan Pujades, based on a design by iczfirz: https://www.thingiverse.com/thing:4196325/, which is a .scad file. I edited the scad file to get the dimensions correct, including space for a 2mm carbon pre-filter, and then attached the cover from the COVID MASK part so that it would thread on. (I also added a rectangle of "blue shop towel" in front of the carbon filter for extra protection). For my own use, I extended the original bushing (see BUSHING_LONG.stl), split the "FEMALE" piece in half, allowing me to put the HEPA filter on the outside of a face shield and secure it in place. To complete the effect, build yourself a face shield using one of the many available options. I used the "Budmen face shield". For the "shield", I used an empty 2L soda water bottle (Great Value brand from Walmart). Just cut off the top and bottom, and cut it down the seam. By the way, the mask that goes on your face (not included in these files) and the HEPA cover (HEPA_COVER.stl) should both be printed using a flexible filament (TPU/TPE), while all other parts are best printed with a rigid material (PLA or PETG).