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 PWM, High-Performance Quiet Fan 40mm

Product ID: 51055796

Details

Air flow capacity
9.4 Cubic Per
Brand
Noctua
Compatible devices
Desktop
Cooling method
forced air
Material
Fibre-glass
Maximum rotational speed
5000 RPM

🌀5000 RPM max speed

🔇Ultra-quiet 14.9 dB(A)

⚙️4-pin PWM for smart control

RM169

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Description

🌀 Cool smarter, not louder — the fan your gear deserves.

COMPACT YET MIGHTY - Sized at 40x40x20 mm, perfect for 1U servers, routers, NAS, and other critical gear demanding efficient cooling in tight spaces.
WHISPER QUIET POWER - Experience top-tier cooling at a barely-there 14.9 dB(A) noise level—because your workspace deserves peace.
PRECISION SPEED CONTROL - 4-pin PWM technology dynamically adjusts fan speed up to 5000 RPM, optimizing airflow exactly when you need it.
AWARD WINNING AERODYNAMICS - Flow Acceleration Channels and Acoustic Optimisation frame deliver superior airflow with minimal noise—engineered for pros who settle for nothing less.
READY FOR SEAMLESS INTEGRATION - Includes anti-vibration mounts, extension cables, and OmniJoin adaptors—plug and play with your existing setup, hassle-free.

The Noctua NF-A4x20 PWM is a premium 40x40x20 mm quiet fan designed for professional-grade cooling in compact devices. Featuring a max speed of 5000 RPM controlled via 4-pin PWM for automatic speed adjustment, it delivers efficient airflow at an ultra-low noise level of 14.9 dB(A). Its award-winning aerodynamic design and included accessories ensure seamless integration and long-lasting performance with a 6-year warranty.

Specifications

ASIN	B07125KWG1
Air Flow Capacity	9.4 Cubic Metres Per Hour
Best Sellers Rank	3,523 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 33 in Thermal Management Products 90 in Fans & Cooling
Brand	Noctua
Compatible Devices	Desktop
Cooling Method	forced air
Country Of Origin	China
Customer Reviews	4.8 4.8 out of 5 stars (1,647)
Global Trade Identification Number	09010018100105
Item Dimensions L x W x H	40L x 40W x 20H millimetres
Item Weight	20 Grams
Manufacturer	Noctua
Manufacturer Part Number	NF-A4x20 PWM
Material	Fibre-glass reinforced PBT
Max Rotational Speed	5000 RPM
Model Number	NF-A4x20 PWM
Noise Level	14.9 Decibels
Number of Items	1
Number of Packs	1
Power Connector Type	4-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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RM169

Duties & taxes included

In stock

Sold byAmazon MalaysiaDelivered 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 Malaysia.

Secure transaction

ProDesertcart PRO

Fast, free shipping, member pricing & priority support.

Join PRO →

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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Very impressed with the quality and fast delivery. Will shop here again.

4 days ago

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Excellent communication throughout the order process. Product is perfect.

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