It looks like the D14 uses the 140mm fans. Sooooo, just get some 4 pin (PMW) fans and swap them out. its really quite easy to do, and you will really like the results. My fans stay at like 600rmp when im just browsing, but with fan x pert I can crank them up to 2000 rpms for overclocking.
WTB - Lian Li PC-V2100