How can I use this fan with a 2 pin connection. I’ve just received it only to find my connection is 2 pin. Doh!

Black is (-), red is (+) and yellow is just the probe. You disconnect/cut the yellow one and you have two active wires.

You replaced Hikvision nvr fan with Noc 40x20. What voltage did u use 12 or 5?

This Noctua fan is rated 5V and this is the voltage to use.

has anyone tried this in a dan a4 case as a top fan? And would it be worth doing?

I don't know where it would fit at the top of the A4, as the riser cables and psu cable take up the space, there might just be enough space on the GPU side. I have this fan zip-tied to the CPU side panel.

Good day, when will this item be back in stock again?

it is https://www.amazon.co.uk/gp/offer-listing/B009NQLT0M/ref=dp_olp_new_mbc?ie=UTF8&condition=new

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Noctua NF-A4x20 FLX, High-Performance Quiet Fan 40mm

Noctua NF-A4x20 FLX, High-Performance Quiet Fan 40mm

Product ID: 51055764

Details

Brand
Noctua
Compatible devices
Server Router
Cooling method
Air
Global Trade Identification Number
Maximum rotational speed
5000 RPM
Noise level
14.9 Decibels

⏳>150,000 h MTTF reliability

🌀5000 RPM max speed

🔇Ultra-quiet 14.9 dB(A)

10.97 OMR

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Description

🌀 Stay cool, stay ahead — silent power in a compact package!

BUILT TO LAST - Award-winning design backed by a 6-year warranty and industry-leading >150,000 hours mean time to failure.
PRECISION COOLING POWER - High-performance 40x20mm fan engineered for optimal airflow in compact 1U devices and network gear.
WHISPER QUIET OPERATION - Advanced Acoustic Optimisation ensures near-silent performance, perfect for noise-sensitive professional environments.
VIBRATION FREE STABILITY - Includes anti-vibration mounts and OmniJoin adaptor for seamless, secure installation and reduced mechanical noise.
CUSTOMIZABLE SPEED SETTINGS - 3-pin FLX design with Low-Noise Adaptors lets you dial in from 3700 to 5000 RPM for tailored cooling vs. silence balance.

The Noctua NF-A4x20 FLX is a premium 40x40x20mm quiet fan designed for professional-grade cooling in compact 1U servers, routers, NAS, and other network devices. Featuring a max speed of 5000 RPM with adjustable settings, ultra-low noise levels at 14.9 dB(A), and exceptional durability with over 150,000 hours MTTF, it delivers reliable, whisper-quiet airflow. Its advanced aerodynamic design and included anti-vibration accessories ensure stable, silent operation, making it the go-to choice for tech-savvy professionals demanding efficient thermal management.

Specifications

ASIN	B071J8CZP9
Best Sellers Rank	2,461 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 15 in Thermal Management Products 52 in Fans & Cooling
Brand	Noctua
Compatible Devices	Server, Router, NAS, Switch, Video Recorder
Cooling Method	Air
Country Of Origin	China
Customer Reviews	4.8 4.8 out of 5 stars (2,610)
Global Trade Identification Number	09010018100112
Item Dimensions L x W x H	40L x 40W x 20H millimetres
Item Weight	20 Grams
Manufacturer	Noctua
Manufacturer Part Number	NF-A4x20 FLX
Max Rotational Speed	5000 RPM
Model Number	NF-A4x20 FLX
Noise Level	14.9 Decibels
Number of Items	1
Number of Packs	1
Power Connector Type	3-Pin
Product Warranty	6 year manufacturer’s warranty
Unit Count	1.0 count
Voltage	12 Volts

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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TrustScore 4.5 | 7,300+ reviews

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