I just did this mod to my JT mask. My mask had been fogging up in the cool misty air the last few times i have played. I had to put two fans on the outside of the mask below the visor since i did not have the space in side the mask. Haven't tried it in a game yet, but it does blow quite a bit of air inside. Ill try to post pics later. Thanks for all the good info.

also i purchased a switch, but with my limited(none) knowledge of wiring i did not know how to install it properly. If anybody can help?