fans.....

[Spudnyk]

Depending on what type of Cannon you constructed if it's a traditional spray and pray in the rear of the gun where the cap is make a little bracket I have mine mounted to a hinge so I can clean the chamber whenever. I also used a momentary button and little led so I know the fan is working when the cap is closed and used a radio shack project box to hold it. Looks custom!

[McCoytheGreater]

Simple sheet aluminum you get at a home improvement store works fine for making a bracket. It's relatively cheap and very easy to work with. A pair of tin snips will shear straight through it, and it does look pretty nifty and all custom-like. Here's a picture of ours. Notice the spark gap behind the running fan and brass fittings for the propane inlet. (You don't really have to notice it. I just thought it was neat)