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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🌀 Stay cool, stay ahead — silent power in a compact frame.

COMPACT YET POWERFUL - Designed for tight spaces like ITX builds and NAS devices without compromising airflow performance.
PRECISION PWM CONTROL - Seamlessly adjust fan speed from 400 to 2000 RPM for perfect thermal management tailored to your workload.
WHISPER QUIET COOLING - Experience near-silent airflow with advanced acoustic optimization for distraction-free productivity.
VIBRATION FREE OPERATION - Includes anti-vibration mounts to keep your setup stable and noise-free, enhancing your workspace ambiance.
READY FOR MULTI FAN SETUPS - Comes with extension and Y-cables to effortlessly synchronize multiple fans on a single PWM header.

The Noctua NF-A9 PWM is a premium 92mm 4-pin PWM fan engineered for ultra-quiet, high-performance cooling. With a broad speed range up to 2000 RPM, advanced acoustic design, and over 150,000 hours mean time to failure, it’s ideal for compact PC cases, CPU coolers, and NAS devices. Included accessories ensure easy installation and multi-fan synchronization, making it the go-to choice for professionals demanding silent efficiency.

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Brand	Noctua
Product Dimensions	9.19 x 2.49 x 9.19 cm; 226.8 g
Item model number	NF-A9 PWM
Manufacturer	Noctua
Series	NF-A9 PWM
Colour	Brown
Computer Memory Type	DIMM
Voltage	12 Volts
Operating System	Windows
Are Batteries Included	No
Number of Lithium Metal Cells	1
Item Weight	227 g
Guaranteed software updates until	unknown

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

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