Site updated: 26.5.19

Everything OK

Everything OK (3rd May 2019 via Trustpilot)
NF-S12A ULN 12V 800RPM 120mm Ultra Low Noise Cooling Fan
20 in stock
(59 customer ratings)

Noctua NF-S12A ULN 12V 800RPM 120mm Ultra Low Noise Cooling Fan

- Replaces the Noctua NF-S12B ULN Ultra Low Noise 120mm Cooling Fan, 500/700 RPM

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.


  1. Noise levels from only 6.7 dB(A)
  2. High 43.73 CFM airflow
  3. Advanced Acoustic Optimisation Frame
  4. Two speed settings for maximum quietness
  5. Smooth SSO-Bearings
  6. Six year warranty

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.

Advanced Acoustic Optimisation Frame
Advanced Acoustic Optimisation Frame

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.

What is Stall?
What is Stall?

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.

Additional Images

SpecificationsNF-S12A ULN
Size120 x 120 x 25 mm
Blade GeometryS-Series with Anti-Stall Knobs
Rotational Speed ±10%800 PRM
Rotational Speed with L.N.A. ±10%600 RPM
Airflow43.7 CFM
Airflow with L.N.A.33.8 CFM
Acoustical Noise8.6 dB(A)
Acoustical Noise with L.N.A.6.7 dB(A)
Static Pressure0.62 mm H2O
Static Pressure with L.N.A.0.44 mm H2O
Input Power0.72 W
Input Current0.6 A
Voltage Range12 V
MTBF> 150.000 h
Warranty72 months
EAN barcode4716123314912

Our Address

Quiet PC Ltd
Brawby Grange
YO17 6PZ
United Kingdom

Our Numbers

Useful Information

Keep In Touch

MasterCardMaestroPayPalAmerican ExpressVisaVisa Electron
30 day money back guarantee
2 year warranty

All prices exclude import tax. © 2000-2019 Quiet PC Ltd. If you have seen an error on this page, please let us know.