Flutterby™! : Corsi-Rosenthal boxes

Interesting: Corsi- Rosenthal box style air filters not only help reduce aerosol disease transmission, they also reduce concentrations of PFAS and phthalates.

Environmental Science & Technology: Does Using Corsi–Rosenthal Boxes to Mitigate COVID-19 Transmission Also Reduce Indoor Air Concentrations of PFAS and Phthalates?

https://doi.org/10.1021/acs.est.2c05169

And I'm trying to find the original cite, but this Toot is claiming some pretty amazing results for smaller particles using MERV13 filters vs HEPA filters because it's easier to get volume through the large surface area of the Corsi-Rosenthal boxes.

I made a couple of plydwood filter carriers for some stand-alone fans because of fire season a few years ago, and they've served us fairly well, but I'm thinking about that larger surface area thing should we need 'em again.