[MaxRat]

There is great debate on wether what is right and what is wrong....

I'd say just try different things to see what works best for you.... I only have 2 case fans...And they are in the window side on the bottom as intakes.... One is under the vid card and one is under the H/D....or i should say Aimed under... they are 92mm standard fans...I think 38cfm...

In all my builds I use that as standard and I use the power supply as the exhaust... I DO NOT agree with a blow hole in the top of the case... If there is a hole there I don't put a fan in it...!

Usually if you have a blow hole it's just ahead of the power supply and fan and if you make it a exhaust and the power supply is trying to exhaust you create a void (dead spot) atleast where I live you do....

How I test case flow is like this....smoke power... also a $ 9.00 home digital inside/outside thermometer ( any home supply store) put the probe inside the case and check temps....

My cases temps never go above 2 degrees F. over ambient room temps...

But, what works for me may not work for you....! you will have to experiment with fan placement/direction....