I built a small booth for parts and epoxy work in my basement. Sealed it off and ducted out an exhaust system. I took an attic fan, extended the shaft (no homo) and atted a pully to the end. then ran the electric motor outside the wall and cut a small slot in the wall to feed the belt through. very little fumes actually go out of the room through that little belt slot. Workes like a champ and it really sucks, fumes.
explosion proof fans are $$$. but then again, if you read up on it, I have yet to see someone actually blow up without them. But this was in my house, so I didnt want to take a chance.