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, Premium Quiet Fan, 4-Pin (40x20mm, Brown)

Noctua NF-A4x20 PWM, Premium Quiet Fan, 4-Pin (40x20mm, Brown)

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

⏳>150,000 h MTTF reliability

🌀5000 RPM max speed

🔇Ultra-quiet 14.9 dB(A)

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178 Lei

Duties & taxes included

In stock

Sold byAmazon RomaniaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌀 Silence Meets Performance: The Ultimate Mini Fan Upgrade You Didn’t Know You Needed

BUILT TO LAST - Engineered with premium materials and backed by a 6-year warranty for unmatched durability and peace of mind.
COMPACT YET MIGHTY - Slim 40x40x20 mm size fits 1U servers, NAS, routers, and DVRs without compromise.
PRECISION PWM CONTROL - 4-pin PWM interface enables smart, automatic fan speed adjustments for optimal thermal management.
WHISPER QUIET POWERHOUSE - Experience near-silent cooling at up to 5000 RPM, perfect for noise-sensitive environments.
COMPLETE INSTALLATION KIT - Includes anti-vibration mounts, extension cables, and OmniJoin adaptors for versatile, hassle-free setup.

The Noctua NF-A4x20 PWM is a premium 40x40x20 mm cooling fan designed for compact devices like 1U servers and NAS units. It features a 4-pin PWM connector for automatic speed control up to 5000 RPM, delivering powerful airflow at an ultra-quiet noise level of just 14.9 dB(A). Engineered with advanced aerodynamic design and acoustic optimization, it ensures superior cooling with minimal sound. The fan comes with a comprehensive accessory kit including anti-vibration mounts and extension cables, and boasts a remarkable mean time to failure of over 150,000 hours, backed by a 6-year manufacturer warranty.

Specifications

ASIN	B07125KWG1
Air Flow Capacity	9.4 Cubic Metres Per Hour
Best Sellers Rank	4,673 in Computers & Accessories ( See Top 100 in Computers & Accessories ) 16 in Thermal Management Products 56 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 (1,594)
Global Trade Identification Number	09010018100105
Item Dimensions L x W x H	40L x 40W x 20H millimetres
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
Power Connector Type	4-Pin
Product Warranty	6 year manufacturer’s warranty
Unit Count	1.0 count
Voltage	12 Volts

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