The 200mm fan on the top is exhaust, so it will help in pulling the air through the hs. The back fan as of now is intake to cool down the heat pipe for the northbridge, The board is a P5B deluxe so the heat pipe is under and behind the cpu hs. It seems to be working well so far. Q6600 @ 3.2 , and after 3+ hrs of gaming it only got to about 55 deg, way better than my other case!!