PC fan on 30 volts

Most PC fans will run perfectly fine up to 15 - 16V, I've been running one in my 1:1 for amp cooling, and it's been there for about 2 years...

If you want a good, high flow 80MM fan, look for the Vantec Tornado... something like 80CFM at 5000 or so RPM, if I remember right...
they're thicker than the average 80MM fan... about 1.5 times, but other than that, they're wicked fans... I'm running two of them in my computer at the moment.... Crazy loud, though