So I saw this thing online: Car air filter thing

And i was wondering if this would work for the UFPs if i just put it next to a 3D printer in an enclosure. It has a HEPA and a charcoal filter, but i dont know much about filtration..

Yes I am sure it would work, if you can fit it in and if you want to spend this much. I've tried a recirculating filter going from the top of an enclosure to the bottom with a vacuum cleaner hepa filter filled with charcoal beads (both very cheap) in line with it. No noticeable ABS smell and the hot air from the top of my enclosure moved effectively back to the bottom. Recirculation has a lot of benefits, you don't need such big filtering capacity and you redistribute air around your enclosure keeping the temperature even. There is a thread here: [forums.reprap.org]