Get it out of your closet. Only have the plants and bulb in the closet, that would keep everything a lot cooler....your ballast might not even get to hott then .....I set my ballast on a metal rack... I made up so it aint touching anything at all ...you can never be to safe what you have somthing to hide like growing. Mine is in a cabinet with no fan but i took mine apart, the out side shield off. All of it is only warm to the touch now....PLEASE get it out of the closet though....thats not even safe....peace