I have an ATA kit, as well. I cheated and got 2 12v computer fans from radio shack, and then ran 2 9v batteries on each of them in sequence with individual buttons so you can use one or both at any given time. I just mounted them inside the lid on the bottom screw for the ear piece of the helmet. The holes in the fan are close enough in size that they didn't need nuts or anything to keep them in place, and that way if I decided to vent the helmet I could just flip one of the fans over. If I didn't need them, I just rotated them back inside the helmet out of view, but you can't really see them anyway. So far I haven't burned out either fan, and it gets hot out here. I use them quite a bit in the winter, too, to keep my lenses from fogging up.