Noctua NF-S12A ULN Ultra Low Noise PC Case Cooling Fan 120mm NF-S12A-ULN

The NF-S12A marks the third generation of Noctua�s signature S12 series quiet case fans; which have received more than 250 awards and recommendations from the international press.

Featuring a further refined blade design with Anti-Stall Knobs that works in tandem with the new AAO or Advanced Acoustic Optimisation frame. The NF-S12A improves the airflow/noise efficiency of its renowned predecessor by up to 8%. The ULN version provides super-slow 800 / 600rpm speed settings for ultra-low-noise applications and highly noise sensitive users who demand near-silent operation. Its superb running smoothness; SSO2-Bearings and Noctua�s trusted premium quality make it an elite choice for quiet case cooling.
Noctua�s Advanced Acoustic Optimisation Frame
Noctua�s AAO (Advanced Acoustic Optimisation) frames feature integrated anti-vibration pads as well as Noctua�s proprietary Stepped Inlet Design and Inner Surface Microstructures; both of which further refine the fan�s performance/noise efficiency.

Anti-stall Knobs: What is Stall?
Noctua�s S12 series fans impellers use a high angle of attack in order to achieve superior airflow. However; impellers with high angles of attack are typically more prone to undesired stall and flow separation phenomena that can occur when the fan is working against higher impedance such as when blowing through tight fan filters or when used on heatsinks and radiators.

In these situations when the fan is building up high pressure but less air is moving through; the speed of the air particles flowing alongside the suction side of the fan blades gradually decreases towards the trailing edge. The lower the speed and the higher the counter-pressure; the higher the risk of the air particles becoming detached from the blade surface. This flow separation phenomenon known as stall leads to undesired turbulence; reduced efficiency and translates into a dent in the fan�s performance curve.
Integrated Anti-Vibration Pads Integrated Anti-Vibration Pads made from extra-soft silicone minimise the transmission of minute vibrations while maintaining full compatibility with all standard screws and other mounting systems.
Smooth Commutation Drive 2
The latest version of Noctua�s advanced Smooth Commutation Drive system ensures superb running smoothness by eliminating torque variations and switching noises. This makes the NF-S12A remarkably quiet even at very close distance.
Stepped Inlet Design
Noctua�s Stepped Inlet Design adds turbulence to the influx in order to facilitate the transition from laminar flow to turbulent flow; which reduces tonal intake noise; improves flow attachment and increases suction capacity; especially in space restricted environments.
Inner Surface Microstructures
With the tips of the fan blades ploughing through the boundary layer created by the Inner Surface Microstructures; flow separation from the suction side of the blades is significantly suppressed; which results in reduced blade passing noise and improved airflow and pressure efficiency.
Package Contents
As expected from Noctua; the fan is well packaged and is supplied with both the usual fan mounting screws and also rubber fan mounts to isolate the fan from the case ensuring that no vibrations from the fan can reach the case. An in-line resistors (L.N.A) is included and this simply lowers the voltage and therefore the speed of the fan from 800 to 600 rpm if full speed isn't required. A Molex adapter allowing you to power the fan from the PSU and an extension cable are also included.

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