I'm using a P180 case. I've replaced the 3 Antec Tri-cool fans with 120mm Yate Loons. I have the front intake and the one in the lower chamber (using lower HDD cage for drives) running at 840rpm. The exhaust I have plugged into the motherboard. With uGuru I set the fan to run at 8v (1020rpm) until 39C, at 40C I have it set to 12v (1350rpm). The top vent/fan hole on the case I have blocked. Here's a bad pic of my setup, I'll try to get some better ones. I'm also working on a duct for the exhaust fan.