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 Gear Deserves

COMPACT POWERHOUSE - 40x40x20 mm size fits perfectly in tight 1U spaces like routers, NAS, and DVRs.
PLUG PLAY VERSATILITY - Comes with extension cable and OmniJoin adaptor for seamless connection to proprietary headers.
PRECISION SPEED CONTROL - 3-pin FLX design with Low-Noise Adaptors lets you dial in airflow or whisper-quiet cooling.
VIBRATION FREE OPERATION - Includes anti-vibration mounts and fan screws for stable, noise-free installation.
AWARD WINNING AERODYNAMICS - Flow Acceleration Channels and Acoustic Optimisation frame deliver superior silent performance.

The Noctua NF-A4x20 FLX is a premium 40x40x20 mm quiet fan engineered for professional-grade cooling in compact devices. Featuring variable speeds up to 5000 RPM, ultra-low noise levels at 14.9 dB(A), and an exceptional lifespan exceeding 150,000 hours, it’s optimized with award-winning aerodynamic design and vibration-dampening accessories. Ideal for 1U servers, network equipment, and storage devices, this fan ensures reliable, whisper-quiet airflow with flexible connectivity options.

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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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