Bro, the 120mm fan behind the cage is supposed to face the CPU, you are (somehow) installing it upside down. This sucks air past the CPU and out the back as o1die stated. Think about it a sec, it only makes sense. If it was facing up, you'd be loosing the added benefit of it helping keep the CPU cooler. I always assumed the screw placement wouldn't allow you to install it upside down, guess I was wrong.