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, プレミアム静音ファン, 4-Pin接続 (92mm, ブラウン)

Noctua NF-A9 PWM, プレミアム静音ファン, 4-Pin接続 (92mm, ブラウン)

Product ID: 725593148

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Details

Product Dimensions
9.2L x 9.2W x
Brand
Noctua
Power Connector Type
4-Pin
Voltage
12 Volts
Cooling Method
Air
Compatible Devices
Desktop

⚡4-pin PWM for smart control

🌀2000 RPM max speed

🔇Ultra-quiet 22.8 dB noise

Description

🖥️ Elevate your PC’s cool factor with silent precision!

COMPACT YET MIGHTY - Perfectly sized 92x92x25 mm fits tight spaces without compromising performance.
WHISPER QUIET POWER - Experience premium airflow with noise levels barely above a whisper at 22.8 dB.
AWARD WINNING DESIGN - Flow Acceleration Channels and AAO frames deliver cutting-edge silent cooling technology.
PRECISION PWM CONTROL - Seamlessly adjust fan speed from 400 to 2000 RPM for optimal cooling and energy efficiency.
COMPLETE INSTALLATION KIT - Includes anti-vibration mounts, extension cables, and Y-cables for effortless setup and dual fan control.

The Noctua NF-A9 PWM is a premium 92mm quiet fan featuring advanced acoustic optimization and Flow Acceleration Channels. It offers a wide PWM-controlled speed range up to 2000 RPM, ultra-low noise at 22.8 dB, and a robust lifespan exceeding 150,000 hours. Ideal for compact PC builds and NAS devices, it comes with a full accessory kit for easy, vibration-free installation.

Specifications

Manufacturer	Noctua
Part number	NF-A9 PWM
Item Weight	227 g
Product Dimensions	9.19 x 2.49 x 9.19 cm; 226.8 g
Is Discontinued By Manufacturer	No
Material	Rubber
Voltage	12 Volts
Airflow	78.9 CMPH
Noise Level	22.8 dB
Batteries Included	No
Batteries Required?	No
Item Dimensions LxWxH	9.2 x 2.5 x 9.2 cm

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