which would be perfect because a thermoelectric generator uses the differences in temperature. So if the space between the motherboards and the heatsink/thermoelectric generator can't be reached by the fan, but the other side of the heatsink/thermoelectric generator can be reached by the fan and cooled, then the electrical output will be greater.
Anyway, 2 questions, where did you get your fan and if you're mining using a Erupter, do you even really need a fast computer or can you just use a cheap, semi-crappy desktop?
You don't need a fast computer. A lot of people have them running with raspberry pi mini computers,
or even smaller devices like tp-link router with openwrt on it. But you need a powered usb hub, because
each usbminer uses like 500ma power or so.