a fan in a spray room booth is called "explosion proof" for a reason! not fire proof nor resistant, 21 years ago i was spraying in the back of what was then my shop, (had no money) i was spraying laquer and simply using a 32" pedestal fan to move the air "BOOM" when it ignites it does not keep blowing in the wind/fan direction it follows the fuel, i got lucky and lost my armhair, eyebrows and most of my hair, nothing ignited beyond that as i was using a hose and the pot was remote. don't mess with this!!!! tommorrow i post some pics of our 1600' booth and two spraybooths with both sprinkler and fire suppression. i have two smaller tube fans and a booth i mught sell, they are perfect for small applications, if you only need a temporary booth you can build a rolling wall line it with galvanized sheet and install a ep fan like graingers, i hope one would notice how hard they are to find and you never see a used one!!! there is a reason for this, if you ignite your house or shop and you insurance finds the fan not ep proof (and they will) you can kiss your claim goodbye
you can find them in poultry barns and automotive applications, the grain industry sell's them as well.
jim mcgrew