Noctua NF-A4x20 PWM Premium Quiet Fan 4-Pin (40x20mm Brown)

Premium quiet fan, mm, 12V, 4-pin PWM, max. 5000 RPM, max. 14.9 dB(A), > h MTTF,Award-winning A-series design with Flow Acceleration Channels and Advanced Acoustic Optimisation frame for superior quiet cooling performance,40x20mm size ideal for 1U servers or replacing fans in network and storage equipment (routers, switches, NAS etc.) or other devices such as DVRs,4-pin PWM version for automatic speed control via 4-pin PWM fan headers, 5000rpm maximum speed (4400rpm with supplied Low-Noise Adaptor),Includes anti-vibration mounts, fan screws, extension cable, y-cable and OmniJoin adaptor set for connecting the fan to proprietary fan headers