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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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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Noctua NF-A9 PWM, High-Performance Quiet Fan 92mm

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 reliability

Description

🌀 Stay cool, stay silent — the fan your rig deserves!

COMPACT YET MIGHTY - Sized at 92x92x25 mm, perfect for tight builds like ITX and HTPC without compromising performance.
WHISPER QUIET POWER - Experience premium airflow without the noise—max 22.8 dB(A) keeps your workspace serene.
PRECISION PWM CONTROL - Seamlessly adjust fan speed from 400 to 2000 RPM for optimal cooling and energy efficiency.
VIBRATION FREE OPERATION - Includes anti-vibration mounts and rubber corners to eliminate distracting rattles and enhance durability.
ALL INCLUSIVE INSTALLATION KIT - Comes with Low-Noise Adaptor, extension & y-cables, plus screws—everything you need for a flawless setup.

The Noctua NF-A9 PWM is a premium 92mm high-performance fan engineered for ultra-quiet operation and superior airflow. Featuring advanced acoustic optimization and Flow Acceleration Channels, it delivers up to 2000 RPM with minimal noise (22.8 dB max) and exceptional reliability (>150,000 hours MTTF). Ideal for compact PC cases, CPU coolers, and NAS devices, it includes a full accessory kit for easy installation and PWM speed control for dynamic cooling efficiency.

Specifications

ASIN	B00RUZ059O
Air Flow Capacity	78.9 Cubic Metres Per Hour
Best Sellers Rank	12,263 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 155 in Thermal Management Products 271 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	227 g
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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