this post was submitted on 08 Oct 2024
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20" box fan + 20" furnace filter. Both are pretty standard sizes. Add duct tape as required.
Here's a video on how to do this: https://youtu.be/EUHVo54tXz0
I did this this year for wildfire smoke, and it works great. Having said that, it is not quiet and the way I was using it was to run it at full blast for an hour, then leave it off for most the day.
If you wanted an always-on solution, I think I'd actually suggest a commercial air purifier.
You could also add in an inexpensive wi-fi smart plug and set up a schedule where it would turn on and run for 15 minutes every 2 hours or so.