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This is maybe the wrong place to post this, but with fire season approaching, a pretty decent high-volume air purifier can be made using filters, tape, and a box fan:

https://www.texairfilters.com/a-variation-on-the-box-fan-wit...

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I used box fan filter setup to get through a couple of CA wildfire seasons, but they're loud and take lots of room. I used 4" filters in a triangle with the fan as the base. This setup is far more effective than a single filter because it makes the fan work better with some air space behind it.

These days, I have a BlueAir 211 in each room. It's the same idea, just professionally made, it's not an eyesore, and it's quiet. Going by my AQI meter, they're also more effective.

Absolutely brilliant. Saved 100 to 300 bucks right there.

Though for some compromises. The ones that autoscale fan speed are really neat.

I've had more than one instant of airfilter going wild reminding me I had forgotten a cooking plate on

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