Anyone think this is a bad idea?
I have decided to encourage airflow in my case from top to bottom (ie against natural convective flow). The reason is that my KK266 mobo puts the CPU right up top next to the power supply. You'd think this would be perfect as I should be able to just jetisson this hot CPU air straight out of the back case vent next to it. However, when there is no fan on this top vent and even when the bottom front vent is set to intake, the power of my cpu fan results in the sucking in of a significant amount of air in thru the top vent (I have two 80mm blowing down on my Zalman--in excess of 70cfm). Thus, I figure by putting an exhaust on the top vent, I'd just be "fighting" with my CPU fans. Better to exhaust out the bottom of my case, I say. Natural convection is not as strong as the forced convection I'd be fighting against.
Ideally, I'd put a blowhole in the top of the case, but I haven't got the tools for that right now.
I'll have a play with different fan configs and see what happens. But was just wondering if anyone else has this problem before I start.