I was suprised to find with mine that its actually slightly sucking in air at the top, I suppose my case has only 1x80mm feeding in from one side, the pair at the back +
psu are all shoving air out. The case does have numerous small holes all over it (it came like that!) they had created a nice dust patter on the backplate heh! At least the holes will be a good place to route water cooling through when i eventually get the funds together to go wet
I did notice a rather nice alu rad down in the lab the other day i shall have to see if its needid anymore as it would suit water cooling a treat!