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Nine Blade Design
The pressure-optimized Nine Blade Design of the NF-P12 (P stands for pressure, power and performance) has been specifically developed for high-impedance applications such as CPU coolers, water-cooling radiators, power supplies or cases with restrictive fan grills. It achieves outstanding static pressure and high airflow at very low noise levels.

While most conventional 120mm rotors possess seven comparably narrow fan blades, the NF-P12's Nine-Blade Design uses nine large, closely spaced blades with a relatively low angle of attack in order to achieve maximum static pressure and high airflow. As a result, the NF-P12 provides no less than 1.68 mm H2O at 1300 rpm, which is something that other fans merely achieve at 1600 rpm or more.

Nine Blade Design


As a matter of principle, increasing the number of blades involves the risk of increasing the aerodynamic noise in general and noises caused by rotor-stator interaction in particular. Basically, an increase in static pressure usually brings about higher noise emissions. In the case of the NF-P12, this problem is dealt with by adding Vortex-Control Notches to the blades' trailing edges. Due to the two notches at the trailing edge, the flows along the suction and pressure side mix more smoothly. This allows for less turbulence and velocity loss, which leads to a significant reduction in noise emission as well as increased efficiency. In order to achieve the smoothest possible transition and maximum noise reduction, the Vortex-Control Notches are rounded in shape.

Nine Blade Design


In addition to optimizing the joining of the flows at the trailing edge, the Vortex-Control Notches fulfil the task of psychoacoustic optimization: Due to the Vortex-Control Notches, trailing edge vortices are split up into several smaller vortices. Thus the noise is spread over a wider range of frequencies and therefore perceived as much less annoying.

Nine Blade Design


The Vortex-Control Notches' effect of psychoacoustic optimization is further enhanced by the staggering of the notches. The Vortex-Control Notches are staggered from blade to blade so that each blade creates a different vortex pattern. As a result, the fan's noise emission is better spread over the frequency spectrum and thereby makes it yet more pleasant to the human ear.

Nine Blade Design


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Noctua
28.02.2015 - ComputerForum.de NH-C12P SE14
Test verdict: "Mit dem Noctua NH-C12P SE14 runden die Kühlerspezialisten aus Österreich ihr Portfolio großer Top-Blower zwischen NH-C14 und NH-L12 mehr als gelungen ab. Der in seiner Urform NH-C12P bereits mehr als sieben Jahre am Markt befindliche Kühler aus der Alpenrepublik weiß durch seine herausragende Verarbeitung, beste Materialien und schiere Liebe zum Detail ebenso zu begeistern, wie durch seine für einen Top-Blower sehr guten Kühlwerte, die er durchweg unter geringster Geräuschentwicklung erreicht." (Benedikt Weiß, ComputerForum.de)
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27.02.2015 - PC Games Hardware 04/15 NF-A14 FLX
Test verdict: "Im Einsatz überzeugt Noctua durch eine geringe Lautstärke und eine angemessenen Kühlleistung, vor allem aber durch das eindeutig leiseste Lager im Test. Egal wie weit wir den Lüfter, unter Nutzung einer Lüftersteuerung mit Start-Boost, drosselten: Auch bei minimaler Luftbewegung können wir keine Nebengeräusche heraushören." (Torsten Vogel, PC Games Hardware 04/15)
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27.02.2015 - TechSupportForum.com NH-U9S
Test verdict: "The conclusion leaves me with the same thoughts that I have when I review any Noctua cooler and those are the thoughts of reviewing an excellently crafted product. Noctua coolers are known across the board for outstanding quality and it’s shown even further with each unit having a six year warranty. These little coolers are small, compact, and certainly worth the investment for any mATX, ATX or mini-ITX system." (Justin Vendette, TechSupportForum.com)
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