hi horror...i use a 4" elicent inline fan to ventilate my closet. i got it used from the local hydro store for only 80 bucks, and those things are like 200 bucks new! it works pretty damn good. i have it place about 2 feet about my light, and it is venting into a hole i cut into the ceiling. before i got the fan and started venting into the ceiling, my temps were in the mid to high 90's. now they never get over 85 even when it's hot outside and in my place. i also have a small desktop fan blowing from the ground up towards my light. the photo is looking up at my ghetto, but effective ventilation system (photo looks weird because i had to tweek it a bit in photoshop to lighten the shadows). good luck!