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Noctua NF-A4x10 FLX 40mm Premium Quiet 3-Pin 12V Fan 4500 RPM 17.9 dB(A) SSO2 Bearing with Low-Noise Adaptor Beige Brown

Brand:
Noctua
Noctua NF-A4x10 FLX - Case fan - 40 mm | NF-A4X10 FLX
Noctua NF-A4x10 FLX 40mm Premium Quiet 3-Pin 12V Fan 4500 RPM 17.9 dB(A) SSO2 Bearing with Low-Noise Adaptor Beige Brown
€25.37 inc. VAT
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NF-A4X10 FLX
€21.32
€25.37 inc. VAT
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Product Code
04:443900
Manufacturer
Noctua
Quick Specs
Size
40 × 40 × 10 mm
Speed
4500 RPM (3700 with L.N.A.)
Airflow / Noise
8.2 m³/h · 17.9 dB(A)
Connector
3-pin 12 V · SSO2 bearing
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Noctua NF-A4x10 FLX — 40 mm Premium Quiet 12 V Fan

40 × 10 mm4500 RPM17.9 dB(A)SSO2 · 6-year warranty

The Noctua NF-A4x10 FLX (part number NF-A4x10 FLX) is a 40 × 10 mm, 12 V 3-pin fan that spins at 4500 RPM with just 17.9 dB(A), made for replacing noisy small fans in 1U servers, NAS units, routers, 3D printers and small-form-factor builds. A Low-Noise Adaptor lowers the speed to 3700 RPM (12.9 dB(A)) when silence matters more than airflow. Typically in stock with fast delivery across Cyprus.

Compatibility Note
This is the 12 V version with a 3-pin connector and 32 × 32 mm hole spacing. Many devices use 5 V 40 mm fans — check your device first; for 5 V headers choose the NF-A4x10 5V. Proprietary 2-pin/3-pin headers can be adapted with the included NA-AC2 cable or OmniJoin adaptor set. 3-pin fans are speed-controlled by voltage, not PWM.

Key Features

 
Flow acceleration channels
Channels on the suction side of the impeller speed up airflow at the outer blade tips, reducing turbulence and noise for a quieter 40 mm fan.
 
SSO2 bearing, IP50
Noctua's SSO2 magnetically stabilised bearing is rated for over 150,000 hours MTTF, and the fan is IP50-rated against dust.
 
Complete accessory kit
Low-Noise Adaptor, 3:2-pin adaptor cable, OmniJoin adaptor set, 30 cm extension cable, 4 anti-vibration mounts and screws are all in the box.

Technical Specifications

Identification
Part Number NF-A4x10 FLX
EAN / GTIN 4716123314691
MPN NF-A4x10 FLX
Performance
Size 40 × 40 × 10 mm (hole spacing 32 × 32 mm)
Rotational Speed 4500 RPM · 3700 RPM with L.N.A. — Low-Noise Adaptor, a resistor cable that reduces speed
Airflow 8.2 m³/h (4.83 CFM) · 6.6 m³/h with L.N.A.
Static Pressure 1.78 mmH2O · 1.21 mmH2O with L.N.A.
Noise Level 17.9 dB(A) · 12.9 dB(A) with L.N.A.
Electrical & Mechanical
Connector 3-pin (voltage-controlled)
Voltage 12 V DC (start 8 V, max 13.2 V)
Current / Power 0.05 A / 0.6 W max
Bearing SSO2 — self-stabilising oil-pressure bearing with magnetic centring, MTTF >150,000 h
Protection IP50 — protected against dust ingress
Cable Length 200 mm (500 mm with extension)
Weight 15 g
Package & Warranty
In the Box Fan, NA-RC10 Low-Noise Adaptor, NA-AC2 3:2-pin cable, OmniJoin adaptor set, NA-EC2 30 cm extension, 4 × NA-AV3 anti-vibration mounts, screws
Colour Beige frame, brown impeller
Warranty 6 years (manufacturer)

Frequently Asked Questions

Can I use the NF-A4x10 FLX in a NAS or network switch?
Yes, if the device has a 12 V fan header. It is a popular quiet replacement for stock 40 mm fans; check the device voltage and connector type first, and use the included adaptors for proprietary connectors.
What do I need to know before buying the Noctua NF-A4x10 FLX?
It is 10 mm thick and runs on 12 V only. For 5 V devices choose the NF-A4x10 5V, and for thicker 40 mm slots with more pressure look at 20 mm-thick models. Noctua fans ship with a 6-year manufacturer warranty.
Is the Noctua NF-A4x10 FLX quiet?
Yes. Noctua's SSO2-style magnetic bearing and optimised impeller keep noise low for the fan size, and all figures quoted here are Noctua's official measurements.
Singular Expert Insight
The NF-A4x10 FLX is one of the quietest ways to fix a whining 40 mm fan in 12 V devices. If your device supplies 5 V, the otherwise identical NF-A4x10 5V is the correct choice. For bigger airflow jobs see our case fans.

Buyer's Guide

Buy it if
You need a quiet 12 V 40×10 mm replacement fan (17.9 dB(A)) for a NAS, server or printer.
Skip it if
Your device supplies 5 V or needs PWM control.
Also consider
Noctua NF-A4x10 5V for 5 V devices.

Features - Noctua - NF-A4X10 FLX

Colour
brown
More Details
Product Code
04:443900
Manufacturer
Noctua
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