Noctua NF-A4x20 5V, Premium Quiet Fan, 3-Pin, 5V Version (40x20mm, Brown)

Premium quiet fan, 40x40x20 mm, 5V, 3-pin Molex, 5000 RPM, 14.9 dB(A), >150,000 h MTTF

Award-winning A-series design with Flow Acceleration Channels and Advanced Acoustic Optimisation frame for superior quiet cooling performance

40x20mm size ideal for 1U applications or replacing fans in network and storage equipment (routers, switches, NAS etc.) or other devices such as DVRs

5V 3-pin version (5000rpm) for 5V-based industrial applications or replacing 5V fans in various devices

Includes anti-vibration mounts, fan screws, extension cable and OmniJoin adaptor set for connecting the fan to proprietary fan headers

Retail Price: $ 14.95

Wholesale Price: Inquire Now

Featuring advanced aerodynamic design measures such as Flow Acceleration Channels and Noctua’s AAO frame, the NF-A4x20 5V is a dedicated 5V version of Noctua’s highly optimised, premium quality quiet 40x20mm fan. Smooth Commutation Drive technology and Noctua’s reference class SSO2 bearings ensure superb running smoothness and excellent long-term stability. Topped off with modular cabling and the OmniJoin Adaptor Set, the NF-A4x20 5V is a premium choice for demanding 5V applications.

5V version

Many devices such as network or storage solutions use 5-volt 40mm fans. With the same operating voltage and the included OmniJoin Adaptor Set that makes it compatible with proprietary fan headers, the NF-A4x20 5V is ideal for replacing noisy or broken 5V 40mm fans.

Warning: Being a 5V fan, the NF-A4x20 5V cannot be run at 12V and will be damaged when used with typical 12V power sources such as PC motherboard fan headers.


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 30cm extension cable OmniJoin adaptor set NA-AV3 anti-vibration mounts Fan screws

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.


	NF-A4x20 PWM	NF-A4x20 FLX	NF-A4x20 5V PWM	NF-A4x20 5V
Connector	12 V	12 V	5V	5V
Voltage	4-pin PWM	3-pin	4-pin PWM	3-pin
RPM:	Max: 5000 / Min: 1200	5000	Max: 5000 / Min: 1100	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

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Noctua NF-A4x20 5V, Premium Quiet Fan, 3-Pin, 5V Version (40x20mm, Brown)

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Product introduction

Shipping Notices

Product Description

5V version

Warning: Being a 5V fan, the NF-A4x20 5V cannot be run at 12V and will be damaged when used with typical 12V power sources such as PC motherboard fan headers.


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 30cm extension cable OmniJoin adaptor set NA-AV3 anti-vibration mounts Fan screws

40x20mm size


	NF-A4x20 PWM	NF-A4x20 FLX	NF-A4x20 5V PWM	NF-A4x20 5V
Connector	12 V	12 V	5V	5V
Voltage	4-pin PWM	3-pin	4-pin PWM	3-pin
RPM:	Max: 5000 / Min: 1200	5000	Max: 5000 / Min: 1100	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

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