Noctua NF-A4x20 PWM fan, 40 mm

The NF-A4x20 5V PWM is a special PWM-controllable 5-V version of Noctua's highly optimised silent 40x20-mm premium fan, which uses the AAO frame system and advanced aerodynamic design measures such as flow acceleration channels. The specially designed NE-FD3 PWM IC with integrated Smooth Commutation Drive technology and the reference class SSO2 bearing guarantee outstandingly smooth running and excellent long-term stability. Modular cabling and the OmniJoin™ adapter set make the NF-A4x20 5V PWM a premium solution for demanding 5-V applications with PWM control

IMPORTANT: The NF-A4x20 5V PWM is a 5-V fan and cannot be operated with 12 V. Operation using common 12-V power sources such as fan connections of PC motherboards will damage the fan.