What I did to control temp via venting was put a 4" axial DC fan (from bghydro) near the top of my cabinet, and have two 1.5" PCV pipe intakes near the bottom. But the pvc pipes are connected to a single long pipe that sucks cool air from the floor, several feet away from the cabinet so as not to suck up air that was vented out. Each PVC pipe intake has a little DC axial fan on it that I got from some litter box air fresheners at Target.The temperature goes no higher than 85 now.