I recently stayed in an apartment that didnt have central air so I created a corsi-rosenthal box since the smoke from the Canadian wildfires were so bad.
After 30 days of continuous use, with very minimal periods of it being turned off, this is what the filters look like!
It's disgusting yet also so satisfying to see the filters get darker from debris, dust, and dirt.
Edit: typos
Someone posted a link to Wikipedia in the comments, came across their names:
Oh, that's disappointing.
could be his brother
Not the weed guy though.
Oh. A CEO of a filter company. I sort of wondered why I couldn't just tape a single filter to a fan, why it required four of them. Maybe it has something to do with air flow limitations, or maybe it has something to do with the guy making a profit on every filter sold lol
Pretty sure its about creating negative suction below the fan. Instead of just pulling air from the intake side of the fan, its pulling it from all 4 directions. Theoretically the air flow going through the filter would be at least 4x but probably more in practice.