First off, these are 5v - not 12v like a lot of trooper fan options.
As a test, I attached one to a 9v battery... and man, it blew like a turbo-vibro-whining overthrusted blower. I bet if I let it run for more than a few seconds, the motor would have burned up.
So, be sure to power it with a battery pack of 1.5v batteries, not to exceed 6v.
My solution...
I bought two of these fans, so I opted for a 4-pack battery holder (AA) from radio shack that has the same connector (2-point prong) as seen on a 9v battery. So, I get the 6v needed from this 4-pack.
The 4-AAs seem to run the two fans at a slight over-voltage (1v only) AND they generate quite a bit of CFM (and without the nearly double over-voltage of the 9v). The cool thing is they are pretty quiet. I am not sure though, how long 4 AA batteries will run two 5v fans. Maybe I will do a test. Shoot, since I have an FX, I have room in there for 2 of these 4 battery holder packs... stay tuned on that.
As for blower placement (and fresh intake air), I just need to figure out where to position the fans to get good air flow in my lid, and to point the blower-side to move air around my face and onto my lenses, to clear any fogging.
Also guys, I will post the part number for the AA battery pack - it is really a good size, AND that 9v-styled connector is great! Also, I can add velcro to the flat side of the pack for easy repositioning after battery swapping.
We shall see.
OH, I also got one of those hearing aid thingies, you know the little box with ear buds AS SEEN ON TV so that you can hear better at... the movies, at church, and so on.
Man, my helmet guts are going to look like a Radio Shack bomb!
Later Guys!
John
The main thing is they are quieter. The generic pc fans tend to buzz.
I got this link off the legion boards. I've never used them personally.
http://www.allelectronics.com/cgi-bin/i ... OWER_.html