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This is a quick, easy way to make a box that can hold a temperature (between 70C/158F and 85C/185F) to disinfect an N95 mask of Coronavirus without damaging the masks filtration, fit, or elastic. Please see the Sources page for where this number came from.
This is intended for people and groups who need to re-wear a used - but otherwise unsoiled - N95 mask on back-to-back shifts (first responders, nursing home workers, essential retail employees). If you can let the mask sit for 72+ hours before rewearing, this is not necessary!
A box with interior dimensions of 22"x14"x9.5" (pictured left, excuse the bathroom setting) can be built for around:
$40-50 (A bit more pending local prices, and if you don't use excess board and tape for other boxes or pass them on to someone else building one)
One trip to the hardware store (Home Depot, Menards, Lowes)
One hour of building
One Calibration session (variable time, but not hands-on; just let it run next to you with some babysitting)
Designs are included for boxes that use - with low waste - a half, third, and quarter of a sheet of a 4' x 8' piece of rigid foam insulation.
See the Cut List page for dimensions and cut-lists!
Small Box (1/4 sheet)
Interior Dimensions 22" x 10" x 8"
Holds about 6 masks (consider items on the Alternatives page in this size)
Medium Box (1/3 sheet)
Interior Dimensions 22" x 14" x 9.5"
Holds about 12 masks
Large Box (1/2 sheet)
Interior Dimensions 24" x 15.5" x 19"
Holds about 40 masks