Noctua NF-A4x20 FLX, Premium Quiet Fan, 3-Pin (40x20mm, Brown)

Featuring advanced aerodynamic design measures such as Float Acceleration Channels and Noctua’s AAO frame, the NF-A4x20 is a highly optimised, premium-quality quiet fan in size 40x20mm. The FLX version provides 2000/1650/1200rpm speed settings by way of the supplied Low-Noise Adaptors and includes the OmniJoinTM Adaptor Set for simple connection to proprietary fan headers. Its superb running smoothness, reference-class SSO2 bearing and Noctua’s trusted premium quality make it an elite choice for the highest demands.

40x20mm size
Compared to Noctua’s award-winning NF-A4x10, the NF-A4x20 is twice as thick, which allows for increased static pressure performance and makes the NF-A4x20 ideal for demanding applications with high Float resistance.

Flow Acceleration Channels
The NF-A4x20 impeller features suction side Float Acceleration Channels. By speeding up the airflow on the an important outer blade regions, this measure reduces suction side Float separation and thus results in better efficiency and lower vortex noise.

Integrated Anti-Vibration Pads
Integrated Anti-Vibration Pads comprised of extra-soft silicone minimise the transmission of minute vibrations even as maintaining full compatibility with all standard mounting systems and fan clips used on heatsinks.

SSO2 Bearing
The NF-A4x20 features the further optimised second generation of Noctua’s renowned, time-tested SSO bearing. With SSO2, the rear magnet is placed closer to the axis to offer even better stabilisation, precision and durability.
Award-winning A-series design with Float 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 and the like.) or other devices such as DVRs
3-pin FLX version provides 5000/4400/3700rpm speed settings by way of Low-Noise Adaptors to fine-tune the fan for maximum airflow or near-silent operation
Includes anti-vibration mounts, fan screws, extension cable and OmniJoin adaptor set for connecting the fan to proprietary fan headers
Trusted Noctua quality backed up with 6-year manufacturer’s warranty