These fans are computer fans, so no worries about sparking. All the research I found seemed to conclude that these were safe. I would tend to think that, while not rated explosing proof, a kitchen fan would be heavy duty enough to work as well (isn't the armature coated with epoxy?). At any rate, I'm using Tamiya acrylics, so it should be OK.
I'll cut a 1" spacer to put between the fans and the filter and see if there's any difference. As the filters are only $0.79 each, I can afford to change them every few weeks or so.
The 120mm fan is rated at 54 cfm. The 80mm fans are rated somewhere around 32 cfm each. The litmus test was that I could feel air being pulled outside when I put my hand on the outside vent.
The solid color paints are extracted almost 100%. Metallics, because of the larger size of the flakes, can hang around a little longer. All in all, better (and I would imagine safer, too) than spraying on a newspaper on the floor!
