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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🌀 Elevate your PC’s cool factor with whisper-quiet precision airflow!

COMPACT YET POWERFUL - Designed for tight spaces like HTPCs and small form factor builds without compromising airflow performance.
PRECISION PWM CONTROL - Seamlessly adjust fan speed from 400 to 2000 RPM for tailored cooling and energy efficiency via 4-pin PWM headers.
WHISPER QUIET COOLING - Experience near-silent operation with advanced acoustic optimization, perfect for focused work or gaming marathons.
VIBRATION FREE STABILITY - Includes anti-vibration mounts to ensure steady, noise-free operation and prolong hardware lifespan.
READY FOR DUAL FAN SETUPS - Comes with a y-cable to effortlessly run two fans on a single PWM header, maximizing cooling potential.

The Noctua NF-A9 PWM is a premium 92x25mm fan engineered for ultra-quiet, high-performance cooling. Featuring advanced acoustic optimization and Flow Acceleration Channels, it delivers efficient airflow at a broad speed range (400-2000 RPM) controlled via 4-pin PWM. Ideal for compact PC cases and CPU coolers, it boasts a remarkable >150,000-hour MTTF lifespan and includes anti-vibration mounts plus accessories for versatile installation.

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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
Voltage	12 Volts
Operating System	Windows
Are Batteries Included	No
Item Weight	227 g
Guaranteed software updates until	unknown

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

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