Noctua NF-A4x10 FLX - Case fan - 40 mm

Featuring advanced aerodynamic design measures such as flow acceleration channels and Noctua's AAO frame, the NF-A4x10 FLX is a highly optimized, premium quality quiet fan in 40 x 10 mm size. Smooth Commutation Drive technology and Noctua's reference class SSO2 bearings guarantee superb running smoothness and excellent long-term stability.

• Flow acceleration channels
• Reduced motor hub size
• AAO frame
• Stepped inlet design
• Integrated anti-vibration pads
• Smooth Commutation Drive 2
• SSO2 bearing
• Low-noise adaptor for full flexibility
• 3 to 2-pin adaptor and polarity protection

• Flow acceleration channels
  The NF-A4x10 impeller features suction side flow acceleration channels. By speeding up the airflow at the crucial outer blade regions, this measure reduces suction side flow separation and thus leads to better efficiency and lower vortex noise.
• Reduced motor hub size
  Thanks to its streamlined, compact motor design, the NF-A4x10's motor hub is smaller than with conventional 4 cm fans. This allows for more blade surface area and thus contributes to the NF-A4x10's superior airflow and pressure performance.
• AAO frame
  Noctua's AAO (Advanced Acoustic Optimization) frames feature integrated anti-vibration pads as well as Noctua's proprietary stepped inlet design and inner surface microstructures, both of which further refine the fan's performance/noise efficiency.
• Stepped inlet design
  Noctua's stepped inlet design adds turbulence to the influx in order to facilitate the transition from laminar flow to turbulent flow, which reduces tonal intake noise, improves flow attachment and increases suction capacity, especially in space restricted environments.
• Integrated anti-vibration pads
  Integrated Anti-Vibration Pads made from extra-soft silicone minimize the transmission of minute vibrations while maintaining full compatibility with all standard mounting systems and fan clips used on heatsinks.
• Smooth Commutation Drive 2
  The latest version of Noctua's advanced Smooth Commutation Drive system ensures superb running smoothness by eliminating torque variations and switching noises. This makes the NF-A4x10 remarkably quiet even at very close distance.
• SSO2 bearing
  The NF-A4x10 features the further optimized second generation of Noctua's renowned, time-tested SSO bearing. With SSO2, the rear magnet is placed closer to the axis to provide even better stabilization, precision and durability.
• Low-noise adaptor for full flexibility
  The NF-A4x10 FLX (flexibility) is supplied with a Low-Noise Adaptor (L.N.A.) that reduces the maximum fan speed from 4500 to 3700 rpm so that it can be fine-tuned for superior airflow or maximum quietness.
• 3 to 2-pin adaptor and polarity protection
  The NF-A4x10 comes with an adaptor from 3-pin Molex to the 2-pin connectors used on many graphics cards or network and storage devices. An integrated diode provides polarity protection on 2-pin connections.

Featuring advanced aerodynamic design measures such as flow acceleration channels and Noctua's AAO frame, the NF-A4x10 FLX is a highly optimized, premium quality quiet fan in 40 x 10 mm size. Smooth Commutation Drive technology and Noctua's reference class SSO2 bearings guarantee superb running smoothness and excellent long-term stability.