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, 4-Pin Premium Cooling Fan for Desktop (92mm, Brown)

Noctua NF-A9 PWM, 4-Pin Premium Cooling Fan for Desktop (92mm, Brown)

Product ID: 138602274

Details

Brand
Noctua
Compatible Devices
Desktop
Cooling Method
Fan
Power Connector Type
4-Pin
Voltage
12 Volts

💨78.9 m³/h airflow

🔇22.8 dB(A) ultra-quiet

⚙️2000 RPM precision speed

¥11118

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Description

💨 Cool your rig, not your vibe — silent power that keeps you ahead.

WHISPER QUIET POWER - Experience premium cooling with just 22.8 dB(A) noise—stay focused without distractions.
PRECISION PWM CONTROL - 4-pin PWM connector enables dynamic speed adjustment from 400 to 2000 RPM for tailored cooling.
LONG LASTING RELIABILITY - SSO2 bearing ensures smooth, durable operation backed by a 6-year warranty—built to perform.
OPTIMIZED AIRFLOW DYNAMICS - 78.9 m³/h airflow with Flow Acceleration Channels for superior heat dissipation.
ADVANCED ACOUSTIC OPTIMIZATION - AAO frame design minimizes vibrations and noise, perfect for sleek, silent setups.

The Noctua NF-A9 PWM is a 92mm premium desktop cooling fan featuring advanced SSO2 bearing technology, Flow Acceleration Channels, and an AAO frame for optimized airflow and ultra-quiet operation at just 22.8 dB(A). With a max speed of 2000 RPM and PWM control, it delivers precise, efficient cooling while maintaining whisper-quiet acoustics, backed by a 6-year warranty for lasting reliability.

Specifications

ASIN	B00RUZ059O
Air Flow Capacity	78.9 Cubic Meters Per Hour
Best Sellers Rank	#109,893 in Computers & Accessories ( See Top 100 in Computers & Accessories ) #601 in Case Fans
Brand Name	Noctua
Compatible Devices	Desktop
Cooling Method	Fan
Customer Reviews	4.8 4.8 out of 5 stars (4,064)
Global Trade Identification Number	04139052263135, 04716123315513
Importer Contact Information	Acro Engineering Company
Item Type Name	Case Fans
Item Weight	227 g
Manufacturer	Noctua, Noctua
Manufacturer Contact Information	Noctua
Max Rotational Speed	2000 RPM
Model Number	NF-A9 PWM
Noise Level	22.8 Decibels
Number of Items	1
Number of Packs	1
Packer Contact Information	Noctua
Part Number	NF-A9 PWM
Power Connector Type	4-Pin
UPC	842431014481 731215275791
Unit Count	1 Count
Voltage	12 Volts
Warranty Description	6 Years

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¥11118

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Japan.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Abdullah B.

Great price for an authentic product. Fast international shipping too!

3 weeks ago

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Received my product in pristine condition. Great service overall.

1 month ago

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