Building a Corsi-Rosenthal Air Filter Box for the first time

It took me about 50 minutes to build this Corsi-Rosenthal air filter box with parts from Home Depot here in Toronto. It's a 20" box fan, four 20"x20"x1" 3M 1900 air filters (1" deep), some duct tape and cardboard. The cardboard came from the fan's box and from a grocery delivery, so you can use just about cardboard you've got around. The shroud has a 15" diameter hole, as suggested by David Elfstrom on Twitter; he ran some tests on this particular fan model and so if you have a different model you may wish to consider a different diameter.

Many thanks to Jim Rosenthal (https://twitter.com/JimRosenthal4) and David Elfstrom (https://twitter.com/DavidElfstrom) for all their efforts to keep us safe and for their specific feedback on this attempt.

References:
* PDF plan: https://edgecollective.io/airbox/
* Article: https://www.wired.com/story/could-a-janky-jury-rigged-air-purifier-help-fight-covid-19/
* Article: https://www.wgbh.org/news/local-news/2021/08/17/diy-air-filters-for-classrooms-experts-are-enthusiastic-and-a-citizen-scientist-makes-it-easy

Видео Building a Corsi-Rosenthal Air Filter Box for the first time канала James Smith