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

Product ID: 51055764

Details

Brand
Noctua
Compatible devices
Desktop
Cooling method
Air
Global Trade Identification Number
Material
Fibre-glass
Maximum rotational speed
5000 RPM

⏳>150,000 h MTTF reliability

🌀5000 RPM max speed

🔇Ultra-quiet 14.9 dB(A)

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Description

🛠️ Silent cooling that means business — keep your gear cool, calm, and collected.

BUILT TO LAST - Crafted with fibre-glass reinforced PBT and backed by a 6-year warranty, ensuring long-term, dependable cooling performance.
COMPACT YET MIGHTY - 40x40x20 mm size fits perfectly in tight 1U spaces, ideal for network gear, NAS, and DVRs without compromise.
WHISPER QUIET POWER - Experience premium airflow at a barely-there 14.9 dB noise level—your workspace’s new silent hero.
PRECISION SPEED CONTROL - 3-pin FLX design with three RPM settings (5000/4400/3700) lets you dial in the perfect balance of cooling and silence.
VIBRATION FREE OPERATION - Includes anti-vibration mounts and OmniJoin adaptor for seamless, rattle-free installation and compatibility.

The Noctua NF-A4x20 FLX is a premium 40x40x20 mm 12V fan engineered for ultra-quiet, high-performance cooling in compact devices like network switches and NAS units. Featuring advanced aerodynamic design, three adjustable speed settings, and anti-vibration accessories, it delivers reliable airflow at a whisper-quiet 14.9 dB(A) noise level with an exceptional lifespan exceeding 150,000 hours. Perfect for professionals seeking silent, efficient thermal management in tight spaces.

Specifications

ASIN	B071J8CZP9
Best Sellers Rank	6,716 in Computers & Accessories ( See Top 100 in Computers & Accessories ) 27 in Thermal Management Products 76 in Fans & Cooling
Brand	Noctua
Compatible Devices	Desktop
Cooling Method	Air
Country Of Origin	China
Customer Reviews	4.8 4.8 out of 5 stars (2,502)
Global Trade Identification Number	09010018100112
Item Dimensions L x W x H	40L x 40W x 20H millimetres
Item Weight	50 Grams
Manufacturer	Noctua
Manufacturer Part Number	NF-A4x20 FLX
Material	Fibre-glass reinforced PBT
Max Rotational Speed	5000 RPM
Model Number	NF-A4x20 FLX
Noise Level	14.9 Decibels
Number of Items	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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5618 kr

Duties & taxes included

In stock

Sold byAmazon IcelandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Iceland.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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