We used a dremel to cut out the 4 squares in the back panel. We have this fan. The two fans on the left were mounted to bring in air. The two fans on the right were mounted in the other direction to pull air out. We purchased this power adapter and this thermal fan controller. The thermal fan controller is set to turns on at 87 degrees and to turn off at 80 degrees so it's not running constantly. I'll try to find time tomorrow to take pictures if there is an interest.