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A Quick-N-Dirty spray booth for about $30 in materials and about twenty minutes of effort. Uses a 64 Qt tub and a BROAN 688 Ventilation Fan (bathroom exhaust fan).

Run a double handful of models through it, and for a basic setup it works really well. Could use a stronger fan if your workspace is bigger than the War Budgies Lab depicted, and a filter could cut down on maintenance. We get about two cold weeks a year, so this was an easy way to survive through it. Cheers!

Although a neat idea, I would highly suggest the filter that you mentioned. Using a spray can without a filter could possibly spark a flame or worse. Propellants can be flammable. And part of that getting to your electric motor could be very hazardous. Just some fyi.

I don't know if a filter would get rid of flammable vapours but you definitely don't want an exposed motor in an exhaust fan. Electric motors often spark and combined with often flammable solvents can turn it in to a flame thrower.

I have heard of 1 person (I think on britmodeller maybe) who started a fire like that.

Exhaust fans when fumes are a risk usually have an enclosed motor that draws cooling from elsewhere (since the motor gets hot it needs air flowing over it, just not solvent-heavy air) or an external motor with a belt drive.

Another option is a centrifugal fan where the motor is mounted outside the cage and/or isolated from the flow, but I don't know if you can buy them cheap enough to be economical in this application. Actually centrifugal fans are really well suited to this because they also are better at maintaining flow rate when a larger pressure rise is needed, such as when you need to blow through ducting or an air filter. I'll have to check what cheap blowers are on the market as I might even swap my spray booth over to one.