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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🌀 Silence Meets Power: The Fan Your Setup Deserves

BUILT TO LAST - Boasts an impressive >150,000 hours mean time to failure, delivering dependable cooling that keeps your tech running longer.
COMPACT POWERHOUSE - Slim 40x40x20 mm size fits seamlessly into tight 1U spaces, ideal for routers, NAS, DVRs, and other critical network gear.
WHISPER QUIET COOLING - Engineered with advanced acoustic optimization and Flow Acceleration Channels to keep noise below 15 dB—so your focus stays uninterrupted.
PRECISION SPEED CONTROL - Three-step RPM settings let you dial in the perfect airflow-to-silence balance for your workspace or server rack.
VIBRATION FREE PERFORMANCE - Includes anti-vibration mounts and OmniJoin adaptors to ensure stable, noiseless operation and easy integration with proprietary headers.

The Noctua NF-A4x20 FLX is a premium 40x40x20 mm 3-pin quiet fan designed for professional-grade cooling in compact spaces. Featuring adjustable speeds up to 5000 RPM, ultra-low noise levels under 15 dB, and advanced acoustic engineering, it’s perfect for 1U servers, network devices, and storage equipment. With anti-vibration mounts and a robust >150,000 hour lifespan, it ensures reliable, whisper-quiet airflow tailored to your precise needs.

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Brand	Noctua
Product Dimensions	4 x 4 x 2 cm; 50 g
Item model number	NF-A4x20 FLX
Manufacturer	Noctua
Series	NF-A4x20 FLX
Colour	beige / brown
Voltage	12 Volts
Are Batteries Included	No
Item Weight	50 g
Guaranteed software updates until	unknown

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

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