I was wondering where would be the best spot to put the vent fan for my box? The side the top? The back? Its 5x4x3deep. I have a 150w hps. It gets very hot. I need the vent to be the best it can. At the moment the ballast is in the box because I need to get a new reflector. If a pic is need ill post one but im on my laptop and dont have one on here..