I have used many of these types of fans for both intake and out take air flow. Although it does work, its not that good at keeping the temps down. I know you dont know what the cfm is, but what about the room? How many cubic feet are you working with? You need the air to move out at about 3 times the cubic feet of the room, especially if your using a passive intake. If you notice that your having heat issues, then your prolly not running a strong enough fan. If this does happen, consider a small intake fan to assist with the intake of new, fresh air. Your idea about building the box to insulate fan noise is a good one. It will work, and makes mounting the fan easy. You just mount it inside your fan box, and put the box where ever you want! Good luck and be safe.