i have zalman 9 case with 1 fan at front 1 fan at the bottom 1 in the roof plus a antek kuler 620 on the back and they are all pulling air out,should i not at least have one fane pulling cool air in ????? my temp in the case is 25c so is hotter than my room witch feels nice and cool would it not be better sucking some cool air in as well.