In the case of Coolergiant, they came up with the idea of implementing a self-contained blower fan inside the unit allowing it to pull air from inside the case and exhaust it out the back, without any bleed off or additional heat added to the PSU component area. The theory behind this is that if the PSU is sitting directly, or near by, the CPU heatsink and fan, the hot air can be carried via the blower out of the system, rather than it being pulled up into an already hot environment within the PSU and then pulled out.



Link: GruntVillE