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
*measurable if you have some damn good instruments.
It will put off about as much heat as a single incandescent light bulb
Fair, and I would say < an incandescent bulb. Cause I'm damn near 40 and remember getting a good MiB experience touching one.