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) noise level

⚙️4-pin PWM for smart speed control

26282CFA

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Sold byAmazon SenegalDelivered 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 - Over 150,000 hours MTTF backed by a 6-year warranty — invest once, cool confidently for years.
COMPACT YET MIGHTY - 40x40x20 mm size fits perfectly in tight spaces like 1U servers, NAS, and network gear — small footprint, big impact.
PRECISION PWM CONTROL - Automatic fan speed adjustment ensures optimal airflow and energy efficiency without lifting a finger.
WHISPER QUIET POWERHOUSE - Experience premium cooling at a barely-there 14.9 dB(A) — your silent productivity partner.
COMPLETE INSTALLATION KIT - Includes anti-vibration mounts, extension cables, and OmniJoin adaptors for effortless, versatile setup.

The Noctua NF-A4x20 PWM is a compact 40x40x20 mm high-performance fan designed for quiet, efficient cooling in tight spaces like 1U servers and network devices. Featuring a 4-pin PWM connector for automatic speed control up to 5000 RPM, it delivers superior airflow at an ultra-low noise level of 14.9 dB(A). The fan includes a rich accessory kit for versatile installation and boasts an impressive lifespan of over 150,000 hours, backed by a 6-year warranty.

Specifications

ASIN	B07125KWG1
Air Flow Capacity	9.4 Cubic Metres Per Hour
Best Sellers Rank	5,442 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 50 in Thermal Management Products 122 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 (1,654)
Global Trade Identification Number	09010018100105
Item Dimensions L x W x H	40L x 40W x 20H millimetres
Item Highlight	High Airflow Low Noise 20mm Thick Fan, for PC and Electronics Cooling, Rich Accessory Kit, 5000rpm 4-Pin PWM
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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