So the other day I was criticized for having my power supply fan facing up instead of down. My issue is that all power supplies have two openings; an intake and an exhaust. In the current configuration it is taking hot air from inside the case and shooting it out the back of the case. If I were to turn it upside down it would take cool air from outside the case and shoot that cool air right back outside. So my question. Why put the psu fan facing down, if that clearly just doesn't seem to work?