Noctua nf a6x25 flx 60mm low noise fan noctuas first 60mm fan features smooth commutation drive technology modular cabling low noise adaptors and a massive six years manufacturers warranty featuring advanced aerodynamic design measures such as flow acceleration channels and noctuas aao frame the nf a6x25 flx is a highly optimised premium quality quiet fan in 60x25mm size smooth commutation drive technology and noctuas reference class sso2 bearings guarantee superb running smoothness