What I did was buy a little (88 cfm) computer fan. I had an old 11V cell phone adaptor already. I took the red and the black wires from the fan and spliced 'em to the adaptor's wires. And it worked. But actually sometime I'm gonna get a stonger (150 cfm) fan and switch it out cause the one Ihave is a little weak. I've read of people running more than one fan of an adaptor. It has to do with the amps. I guess you just need to make sure you fans total would need less than the adaptor puts out. Hope this all helps.