I currently have 6 fans 5 being TT 1800 rpm and 1 a CM variable fan with its own controller. Any ways i have 1 in from bottom, side, front. I made the rear intake because my 2 top fans being so close to the rear fan that the rear fan would struggle to blow air out because the 2 top were so strong being so close. I want to also note I have a CM V8 cpu cooler that by having that rear intake it blows directly over the cooler. What do you think, I never have any heat issues.