Noctua NF-A4x20-FLX 40mm NF-A4x20 FLX 5000RPM Fan

SKU : NF-A4x20-FLX
Brand : Noctua
Availablity : on order
On Order items usually have to be ordered in and may take bit longer to get them delivered from our Seven Hills, NSW warehouse
Bearing: SSO2, Input power (max.): 0,6 W, Input current (max.): 0,05 A, Operating voltage: 12 V, MTTF: 150.000 h, Size: 40x40x20 mm, Mounting hole spacing: 32x32 mm.
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Product Description

Manufacture # Noctua | Model # NF-A4x20-FLX


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.



  • 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.
  • The latest version of Noctua's advanced Smooth Commutation Drive system ensures superb running smoothness by eliminating torque variations and switching noises. 
  • The fan's short 20cm primary cable minimises cable clutter in typical applications while the supplied 30cm extension provides extended reach when necessary.
  • 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.



  • Bearing: SSO2
  • Input power (max.): 0,6 W
  • Input current (max.): 0,05 A
  • Operating voltage: 12 V
  • MTTF: 150.000 h
  • Size: 40x40x20 mm
  • Mounting hole spacing: 32x32 mm


Manufacturer Warranty: 06 Years Limited Warranty

Technical Specifications

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 H?O
Static pressure with L.N.A. 1,75 mm H?O
Static pressure with U.L.N.A. 1,23 mm H?O
Input power (max.) 0,6 W
Input current (max.) 0,05 A
Operating voltage 12 V
MTTF 150.000 h

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