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 Connection (92mm, Brown)

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

Product ID: 725593148

Details

Air Flow Capacity
78.9 Cubic Per
Brand
Noctua
Compatible Devices
Desktop
Cooling Method
Air
Material
Fiberglass PBT
Maximum Rotational Speed
2000 RPM

⚡4-pin PWM for smart control

🌀2000 RPM max speed

🔇22.8 dB(A) ultra-quiet

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VT12538

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Description

🛠️ Upgrade your rig with the silent powerhouse that keeps your cool and your edge sharp.

COMPACT YET MIGHTY - Sized at 92x92x25 mm, this fan fits perfectly in tight spaces like HTPCs, ITX builds, and NAS devices without compromising performance.
WHISPER QUIET POWER - Experience premium cooling with noise levels as low as 22.8 dB(A), perfect for focused work or gaming marathons.
AWARD WINNING DESIGN - Leverage Noctua’s patented Flow Acceleration Channels and Advanced Acoustic Optimisation for superior airflow and silent operation.
PRECISION PWM CONTROL - Seamlessly adjust fan speed from 400 to 2000 RPM via 4-pin PWM for optimal airflow and energy efficiency.
COMPLETE INSTALLATION KIT - Includes anti-vibration mounts, low noise adapters, extension and Y-cables—everything you need for a hassle-free upgrade.

The Noctua NF-A9 PWM is a premium 92mm quiet fan featuring a 4-pin PWM connector for dynamic speed control up to 2000 RPM. Engineered with advanced acoustic optimization and flow acceleration channels, it delivers exceptional cooling performance at a whisper-quiet 22.8 dB(A). Designed for compact PC cases and CPU coolers, it includes a full accessory kit for easy installation and vibration-free operation, boasting an impressive lifespan of over 150,000 hours.

Specifications

ASIN	B00RUZ059O
Air Flow Capacity	78.9 Cubic Meters Per Hour
Amazon Bestseller	#63,580 in Computers ( See Top 100 in Computers ) #523 in Computer Case Fans
Brand Name	Noctua
Compatible Devices	Desktop
Cooling Method	Air
Customer Reviews	4.8 4.8 out of 5 stars (3,987)
Global Trade Identification Number	04139052263135, 04716123315513
Item Dimensions L x W x H	9.2L x 9.2W x 2.5H cm
Item Weight	227 g
Manufacturer	Noctua
Material Type	Fiberglass reinforced PBT
Maximum Rotational Speed	2000 RPM
Model	NF-A9 PWM
Noise Level	22.8 Decibels
Part Number	NF-A9 PWM
Power Connector Type	4-Pin
UPC	842431014481 731215275791
Unit Count	1.0 Count
Voltage	12 Volts

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