You need to get at the wiring of the fan. Use the red and black wires. What I did was; cut the end off an old 11V cell phone charger, connected the two wires from that to the red and black wires on the fan. Another person wrote that if the fan's turning the wrong way, just switch the wires. It worked like a champ. But I bought a weakass 88cfm fan. I need a 155cfm or even more. But it's all good. Just learning more everyday. Good luck.