Can I use a pc case fan for a tumble dryer?
The part number you quote "3610VL-04W" is for a fairly standard 12V plastic case fan, with a rated highest operating temperature of 70C and a speed of 5600rpm. 70C seems to be the standard maximum for no-name budget case fans so you should be fine. Be aware that the pinout might be different (non PC applications often swap the 12V and the tacho pins over), and make sure the replacement fan has the same or equivalent fire rating. You should pick something which approximately matches the 96.4 CFM rating and the back pressure rating (150Pa). However given the controller hasn't complained until the fan got down to 1200rpm from 5900, I suspect you've got quite a lot of leaway.