Is this a 3 pin or 4 pin fan?

It is a 4 pin fan, however; it could be connected to 3 pin but it will run at full speed, according to the manual

Does this fan come with a retension clip to attach to a nh-u9s?

No it does not but the nh-u9s comes with two sets of retention clips, two for each fan.

Is this NF-A9 PWM delivered with a Y-adapter for two fan hookup?

Yes It is complete with a Y csble, an extension cable and a speed reducer. It is packed in a quality box like expensive watches with formed padding.

Is it possible to wire with 2 wires, a hot and a ground?

yes. You need to connect 12V + Ground http://noctua.at/en/products/cpu-cooler-retail.html?faq_view=72

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NF-A9 PWM, Premium Quiet Fan, 4-Pin (92mm, Brown)

Product ID: 23490436

Details

Brand
Noctua
Compatible Devices
Desktop
Cooling Method
Air
Material
Fibre-glass
Maximum Rotational Speed
2000 RPM
Noise Level
22.8 Decibels

⏳>150,000 h MTTF reliability

🌀2000 RPM max speed

🔇Ultra-quiet 22.8 dB(A)

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27255CFA

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Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌀 Stay cool, stay silent — the fan your setup deserves.

COMPACT YET POWERFUL - Designed for tight spaces like ITX builds and NAS devices without compromising airflow performance.
PRECISION PWM CONTROL - Seamlessly adjust fan speed from 400 to 2000 RPM for tailored cooling and energy efficiency via 4-pin PWM headers.
WHISPER QUIET COOLING - Experience near-silent airflow with advanced acoustic optimization, perfect for focused work or gaming marathons.
VIBRATION FREE OPERATION - Includes anti-vibration mounts to eliminate distracting noise and enhance system stability.
ALL INCLUSIVE INSTALLATION KIT - Comes with extension cables, Y-splitter, and low-noise adaptor for effortless setup and multi-fan synchronization.

The Noctua NF-A9 PWM is a premium 92mm case fan engineered for ultra-quiet, high-performance cooling. Featuring a broad 400-2000 RPM speed range controlled via 4-pin PWM, it delivers efficient airflow with minimal noise (22.8 dB(A)) and exceptional durability (>150,000 hours MTTF). Ideal for compact PC builds and sensitive environments, it includes anti-vibration mounts and versatile accessories for easy installation and optimal system harmony.

Specifications

ASIN	B00RUZ059O
Best Sellers Rank	#47 in Computer Case Fans
Brand Name	Noctua
Compatible Devices	Desktop
Cooling Method	Air
Customer Reviews	4.8 4.8 out of 5 stars (4,176)
Global Trade Identification Number	04139052263135, 04716123315513
Item Dimensions L x W x H	3.62"L x 0.98"W x 3.62"H
Item Weight	8 ounces
Manufacturer	Noctua
Material Type	Fibre-glass reinforced PBT
Maximum Rotational Speed	2000 RPM
Model	NF-A9 PWM
Noise Level	22.8 Decibels
Number of Items	1
Part Number	NF-A9 PWM
Power Connector Type	4-Pin
UPC	842431014481 731215275791
Unit Count	1.0 Count
Voltage	12 Volts
Warranty Description	6 year manufacturer’s warranty

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