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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
21.05.2015 - hardwareinside.de NH-L9x65
Test verdict: "Insgesamt lässt sich festhalten, dass Noctua mit dem NH-L9x65 einen soliden Top-Blow-Kühler für fast jeden Sockel geschaffen hat, der alle ihm gestellten Aufgaben zuverlässig löst." (Sebastian Weickelt, hardwareinside.de)
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21.05.2015 - hwresources.org NF-F12 industrialPPC-2000 PWM
Test verdict: "Noctua continua a stupire in tutte le fasce di mercato. Le versioni testate oggi ci hanno convinto appieno, in particolar modo le versioni Industrial PPC, fan che rasentano la perfezioni in ogni aspetto." (Michele Mura, hwresources.org)
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21.05.2015 - PC-Max.de NF-S12B redux-1200
Test verdict: "In jedem Fall verdienen auch NF-F12 industrialPPC-2000, NF-F12 industrialPPC-3000 PWM und NF-S12B redux-1200 unsere Redaktionsempfehlung." (William Zwingenberger, PC-Max.de)
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21.05.2015 - ComputerForum.de NH-L9x65
Test verdict: "Der NH-L9x65 ist aktuell für uns ganz klar eines: Der König unter den kompakten HTPC-Kühlern!" (Benedikt Weiß, ComputerForum.de)
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