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, High-Performance Quiet Fan 92mm | High Airflow, Low Noise, 25mm Thick Fan, for PC and Electronics Cooling, Rich Accessory Kit, 2000rpm 4-Pin PWM

Noctua NF-A9 PWM, High-Performance Quiet Fan 92mm | High Airflow, Low Noise, 25mm Thick Fan, for PC and Electronics Cooling, Rich Accessory Kit, 2000rpm 4-Pin PWM

Product ID: 47874224

Details

Air flow capacity
78.9 Cubic Per
Brand
Noctua
Compatible devices
Desktop
Cooling method
Air
Material
Fibre-glass
Maximum rotational speed
2000 RPM

🌀2000 RPM max speed

🔇Ultra-quiet 22.8 dB(A)

🛠️>150,000 h MTTF durability

Description

🌀 Elevate your cooling game with whisper-quiet precision and pro-grade airflow!

ADVANCED AERODYNAMICS - Flow Acceleration Channels and Inner Surface Microstructures boost airflow efficiency while slashing vortex noise.
ALL INCLUSIVE PRO KIT - Comes with Low-Noise Adaptor, extension and y-cables, anti-vibration mounts, and screws—ready for any compact build upgrade.
PRECISION PWM CONTROL - Seamlessly adjust fan speed from 400 to 2000 RPM for optimal cooling and energy efficiency via 4-pin PWM headers.
VIBRATION FREE OPERATION - Integrated anti-vibration silicone mounts ensure ultra-smooth, silent performance without compromising stability.
WHISPER QUIET POWERHOUSE - Experience premium airflow at a barely-there 22.8 dB noise level—your workspace stays cool and calm.

The Noctua NF-A9 PWM is a premium 92mm high-performance fan engineered for ultra-quiet operation and superior airflow. Featuring advanced aerodynamic designs like Flow Acceleration Channels and an AAO frame, it delivers up to 2000 RPM with minimal noise (22.8 dB). Its 4-pin PWM control allows dynamic speed adjustment, while anti-vibration mounts ensure silent, stable operation. Designed for compact PCs, NAS, and CPU coolers, it boasts exceptional durability with over 150,000 hours MTTF and includes a comprehensive accessory kit for seamless installation.

Specifications

ASIN	B00RUZ059O
Air Flow Capacity	78.9 Cubic Metres Per Hour
Best Sellers Rank	5,231 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 69 in Thermal Management Products 132 in Fans & Cooling
Brand	Noctua
Compatible Devices	Desktop
Cooling Method	Air
Customer Reviews	4.9 4.9 out of 5 stars (4,075)
EU Spare Part Availability Duration	1 Years
Global Trade Identification Number	04139052263135, 04716123315513
Included Components	NF-A9 PWM
Item Dimensions L x W x H	25L x 92W x 92H millimetres
Item Weight	0.5 Pounds
Manufacturer	noctua
Manufacturer Part Number	NF-A9 PWM
Material	Fibre-glass reinforced PBT
Max Rotational Speed	2000 RPM
Model Number	NF-A9 PWM
Noise Level	22.8 Decibels
Number of Items	1
Number of Packs	1
Power Connector Type	4-Pin
Product Warranty	2 year manufacturer
UPC	842431014481 731215275791
Unit Count	1.0 count
Voltage	12 Volts

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