A:AnswerI would look at moving the fan if its sucking in the hot air exhaust from the power supply, look lower down for vents or at the front of the case towards the bottom if a fan isn't already there would be a good spot to.
A:AnswerCome on man get your ruler out lol... there is two different size fans in most cases this is the smaller fan found in small atx cases and in power supplies.