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

Noctua NF-A4x20 FLX, Premium Quiet Fan, 3-Pin (40x20mm, Brown) by Amazon.co.uk

Price last update: 13/06/2025

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Description

Featuring advanced aerodynamic design measures such as Flow 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 5000/4400/3700rpm speed settings via the supplied Low-Noise Adaptors and includes the OmniJoin Adaptor Set for easy 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 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.
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.
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.
Scope of delivery
NA-RC10 Low-Noise Adaptor (L.N.A)
NA-RC12 Ultra-Low-Noise Adaptor (U.L.N.A)
NA-EC2 30cm extension cable
OmniJoin adaptor set
4x NA-AV3 anti-vibration mounts
Fan screws
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.
Connector
12 V
12 V
5V
5V
Voltage
4-pin PWM
3-pin
4-pin PWM
3-pin
RPM
Max: 5000 / Min: 1000
5000
Max: 5000 / Min: 1000
5000
RPM with L.N.A.
4400
4400
-
-
RPM with U.L.N.A.
-
3700
-
-
Acoustical Noise
14,9 dB(A)
14,9 dB(A)
14,9 dB(A)
14,9 dB(A)
Acoustical Noise with L.N.A.
12,2 dB(A)
12,2 dB(A)
-
-
Acoustical Noise with U.L.N.A.
-
8,5 dB(A)
-
-
Size
40x40x20 mm
40x40x20 mm
40x40x20 mm
40x40x20 mm
Colour
Brown & Beige
Brown & Beige
Brown & Beige
Brown & Beige