Nope,
The way it works, is that all stock fans have been changed out for noiseblocker pro 1200rpm fans. The rear one is reversed so it's an intake (have also added a filter to stop dust). I've actually mounted each corner of the rear fan using 6 rubber grommets to distance it slightly from the rear grille. This cuts out turbulence. The bottom fan is also an intake, as is the fan cooling the HD's. And finally the 2 sidefans on the sidepanel are intakes. So that's 5 intakes all controlled by a 6 channel lian li fan controller (the 6th channel controls the memory cooler). Most of the time I leave the fan intakes at minimum or close to, except when gaming. The top fans are all exhausts. There are 4 apache blacks, with 2 in push pull for the H50. I have them all hooked up to an akasa pwm fan cable (which powers off molex) and they are going directly into the cpu fan header on the motherboard. They spin faster when the cpu gets hotter. Most of the time they spin at around 950rpm. When gaming I turn the intakes up. This generates positive airflow. So far have had very very little dust get into the case.