@doctorq
The "stste of the art" in coolings, is the new Mac G5 tower.(9 fans)
It uses some fans that "blows in" air inside the case (with its relative filters) and other that blows out (IIRC for thermal convention pourpose).
You should use 1 fan that blows in, in the front of the tower (remember the filter) and another one that blows out at the rear of the case.
Ciao
