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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Noctua 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 durability

🌀2000 RPM max speed

🔇22.8 dB(A) ultra-quiet noise

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$47.78

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Description

🛠️ Upgrade your airflow game with the fan that works as hard as you do!

BUILT TO LAST - Engineered with fibre-glass reinforced blades and SSO2 bearing, ensuring over 150,000 hours of reliable operation.
PRECISION PWM CONTROL - Seamlessly adjust fan speed from 400 to 2000 RPM for perfect thermal management tailored to your workload.
WHISPER QUIET COOLING - Experience near-silent airflow with advanced acoustic optimization that keeps your workspace distraction-free.
COMPLETE ACCESSORY KIT - Includes anti-vibration mounts, extension and Y-cables, and a Low-Noise Adaptor for effortless installation and noise tuning.
VERSATILE COMPATIBILITY - Ideal for compact PC builds, NAS devices, and 9cm CPU coolers, making it the go-to upgrade for small form factor enthusiasts.

The Noctua NF-A9 PWM is a premium 92mm 4-pin fan designed for ultra-quiet, efficient cooling in compact PCs and NAS devices. Featuring a max speed of 2000 RPM and noise levels as low as 22.8 dB(A), it combines advanced acoustic optimization with durable fibre-glass reinforced blades and a legendary >150,000-hour lifespan. Its PWM control and comprehensive accessory kit make it a versatile, long-lasting upgrade for professionals demanding silent, reliable performance.

Specifications

ASIN	B00RUZ059O
Best Sellers Rank	#64 in Computer Case Fans
Brand Name	Noctua
Compatible Devices	Desktop
Cooling Method	Air
Customer Reviews	4.8 4.8 out of 5 stars (4,185)
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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