Noctua NF-A4X20 FLX 3pin 5000RPM Case Fan

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 flow resistance.

Flow Acceleration Channels
The NF-A4x20 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.

AAO frame
Noctua's AAO (Advanced Acoustic Optimisation) 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.

Inner Surface Microstructures
With the tips of the fan blades ploughing through the boundary layer created by the Inner Surface Microstructures, flow separation from the suction side of the blades is significantly suppressed, which results in reduced blade passing noise and improved airflow and pressure efficiency.

Integrated Anti-Vibration Pads
Integrated Anti-Vibration Pads made from extra-soft silicone minimise 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 fan remarkably quiet even at very close distances.

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 provide even better stabilisation, precision and durability.

3 speed settings for full flexibility
Providing 5000, 4400 and 3700 rpm speed settings via the supplied Low-Noise and Ultra-Low-Noise Adapters, the NF-A4x20 FLX (Flexibility) can be fine-tuned for superior airflow or maximum quietness.

OmniJoin™ adaptor set
Many devices featuring 40mm fans use proprietary fan headers, so the NF-A4x20 comes with Noctua's OmniJoin™ adaptor set. Just cut the original fan's cable, fix it to the adaptor using the supplied cable connectors and you can plug the NF-A4x20 to proprietary fan headers!

OmniJoin™ adaptor set
Many devices featuring 40mm fans use proprietary fan headers, so the NF-A4x20 comes with Noctua's OmniJoin™ adaptor set. Just cut the original fan's cable, fix it to the adaptor using the supplied cable connectors and you can plug the NF-A4x20 to proprietary fan headers!

Technical Details

Brand : Noctua
Model : NF-A4X20 FLX

Specification

Size : 40x40x20 mm
Mounting hole spacing : 32x32 mm
Connector & pin-configuration : 3-pin
Cable length : 20cm + 30cm NA-EC1 extension cable
Bearing : SSO2
Blade geometry : A-Series with Flow Acceleration Channels
Frame technology : AAO (Advanced Acoustic Optimisation)
Rotational speed (+/- 10%) : 5000 RPM
Rotational speed with L.N.A. (+/- 10%) : 4400 RPM
Rotational Speed with U.L.N.A. (+/- 10%) : 3700 RPM
Airflow :9,4 m³/h
Airflow with L.N.A. : 8,3 m³/h
Airflow with U.L.N.A. : 6,9 m³/h
Acoustical noise : 14,9 dB(A)
Acoustical noise with L.N.A. : 12,2 dB(A)
Acoustical noise with U.L.N.A. : 8,5 dB(A)
Static pressure : 2,26 mm Hâ‚‚O
Static pressure with L.N.A. : 1,75 mm Hâ‚‚O
Static pressure with U.L.N.A. : 1,23 mm Hâ‚‚O
Max. input power : 0,6 W
Max. input current : 0,05 A
Operating voltage : 12 V
MTTF : > 150.000 h