I'm not in the market myself, but I would strongly consider buying these evolutions of the Corsi-Rosenthal Box (aka filter taped to a box fan): https://www.cle

I'm not in the market myself, but I would strongly consider buying these evolutions of the Corsi-Rosenthal Box (aka filter taped to a box fan): https://www.cleanairkits.com/ https://www.cleanairkits.com/ HEPA-type air purifiers are increasingly laden with features that add no value, like poor air quality sensors, wifi connections for Alexa/Google assistant, ozone generators that everyone says to disable, bright lights and LED displays, and proprietary filters. The Clean Air Kits products use commodity parts with as few electronics as necessary, and operate in the way that most people recommend: non-interactively and continuously running at a single speed. They are physically smaller, quieter, and use less power than the other commercial air purifiers.