Hey MARK956
There was a very good article on building your own paint booth in Finescale Modeler. The on site index says that it was in the December 2000 issue. That may be right, but I was thinking it was a more recent issue.
The exhaust motors that they recommended were from Grainger Supply. A wholesale company. You may be able to purchase it yourself but if not, find a friend who has an automotive shop or works for one. They should be able to get one for you.
Randie