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I’ve seen these DIY air purifiers before and thought a out making one but am unsure how well they actually work. Has anybody here actually made one before?
Depends on the quality of the filters really. Also helps if you put a shroud on the box fan so you don’t have backflow around the corners.
https://www.texairfilters.com/how-to-improve-the-efficiency-of-the-box-fan-and-merv-13-filter-air-cleaner/
Effectiveness is pretty much entirely dictated by what filter you choose, assuming you don’t mess up building it and leave huge gaps. This guy on youtube made a video showing the effectiveness of different filters: https://www.youtube.com/watch?v=XAJ__E-hIJc
I have one with just some cheapo filters in my workshop. Does a great job of keeping dust out of the air for paint and finish work.