PM2.5 is at 104ug/m3 indoors with an open window.
this post was submitted on 06 Jun 2025
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Just tacking on that box fan filters are really easy to make and do a solid job in my experience. Use high quality filters (like MPR 1900+/Merv13+), duct tape them into a cube (air direction facing inward in my case) and duct tape it to the intake side of the fan, I use 4 filters with the bottom being a cardboard blank, but there's a ton of designs out there.
This is what I came up with.
There's a HEPA in the magic blue box. Closed off all other windows that could act as air intake. Turned on the bathroom and kitchen fans. They take air from the inside and exhaust it outside. We're doing ~600 CFM at the intake pipe. The HEPA is tiny in comparison to what a Corsi-Rosenthal box uses but it's compensated by having a high static pressure fan that can pull much more air through it. If it didn't work I was gonna go to CT to get some filters and a fan. :D
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