Advice on extraction fan

[JoeH]

I would think that one of two things would work. One would be to find a "squirrel cage" centrifugal fan that you can power with an external induction motor. Something like dust extraction systems. The other would be to use an air pump (fan) to feed air into your exhaust pipe and suck the paint fumes out that way. I think if you search on venturi type systems you might find something. I'm curious to see what you come up with.