.. then use just one fan ... they're only the size of a half-dollar (squared) and less than 1/4" thick .... you're thinking of the BIG CPU fans ... you need to look for the SMALL CPU fans ... the ones that are used on video cards are even smaller and still work great .... you could even hook on of those up to a solar panel that would generate using a standard household light source ... just drill a small hole in the humi for the cord to pass through ... then, from the inside, pass the two small wires through the hole in the humi to the outside, solder/connect the fan to the solar panel, used THIN carpet tape (double sided scotch tape basically) to mount the solar panel over the hole (usually on top in a back corner of the humi). The solar panels are about half the size of a credit card (or less). You have to match the output of the panel with the volts required of the fan. You can also (a little more expensive) just go to Radio Shack and pick up the parts over the counter ... less than $20 total though. I have extra crap lying around the house that I'd be glad to ship out ... next time I get home .... and unfortunately that could be awhile. But - you have the basic idea ...
Jim
