you can fit any 140x140x25 fans to it. akasas have a reputation for there fans but its not a good 1. they tend to be cheap and poorly engineered. every 1 i have used has started to rattle after a few weeks or months. better to go with something like the noctua nf 14's they have high static pressure with good cfm flow and best of all they dont mind being under volt'd if you want them to run near silent.