Are there any example builds you could point me towards?
I use CleanAirKits, but you could build your for far less if you prefer.
Corsi-Rosenthal Box is probably the premier DIY
https://en.wikipedia.org/wiki/Corsi%E2%80%93Rosenthal_Box
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I use CleanAirKits, but you could build your for far less if you prefer.