Noctua NF-A4x20 5V PWM | 40mm Case Fan

With advanced aerodynamic design features such as Flow Acceleration Channels and an AAO frame, the NF-A4x20 5V PWM is a PWM-enabled 5V variant of Noctua's highly optimized, premium-quality, and quiet 40x20mm fan. The custom-designed NE-FD3 PWM IC, integrating Smooth Commutation Drive technology and Noctua's reference-class SSO2 bearings, ensures superb running smoothness and excellent long-term stability.