The NF-A6x25 is a fan that utilizes cutting-edge aerodynamic design features such as Flow Acceleration Channels and Noctua's AAO frame system. The PWM version employs Noctua's custom-designed NE-FD1 IC for fully automatic speed control via 4-pin connectors and is supplied with a low-noise adapter, which reduces the maximum speed in PWM operation from 3000 to 2100 RPM. Its outstanding operational smoothness, the SSO2 reference-class bearing, and Noctua's proven premium quality make the NF-A6x25 PWM an exquisite choice for the highest demands.