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If you put the fan at the back of the booth, it will draw the air back into the booth and this will prevent the fumes coming forward.....this will also help draw the over-spray away .......what are you doing about a light source?
I cut a window in the roof of my booth, put a piece of lexan over the opening and have a fluorescant light above....it works pretty good.....
make sure to duct the fan to the outside so the fumes aren't just getting moved too....most computer/panel fans are brushless anyhow, so there should be little to worry about when it comes to sparks....
Ray
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