Instead of bolting the fan down, I just used zip ties to hold it to the top of the mask at an angle. It works great for me and my buddies mask. The fans and everything are from RadioShack too. The people at my RadioShack are excellent, you just have to find the right location. BTW I used a 12v batt that usually goes in the handheld remotes for car alarms and a battery holder for an "N" battery. It works good. I'm thinking about swithching to a 9v setup though. The 9v's are cheaper.
Will a 9v batt run a 12v fan for very long, or should I stick with what I have?