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Noctua Straight-Blade-Design
Current silent fans frequently employ conventional blade geometries, which were developed for higher speed ranges and significantly lose efficiency at lower rotation speeds. The Noctua Straight-Blade-Design of the NF-S12 series was developed by the Austrian Institute for Heat-Transmission and Fan Technology (Österreichisches Institut für Wärmeübertragung und Ventilatorentechnik, ÖIWV) and specifically tailored to 120mm fans with extremely low rotation speeds. The result is a performance improvement of up to 10% and more compared to conventional blade geometries.

    The Straight-Blade-Design of the NF-S12 series provides the maximum efficiency of a straight fan blade without the drawback of higher noise emission, which arises when straight blades are used at higher rotation speeds. At the low rotation speeds of the NF-S series, the Noctua Straight-Blade-Design achieves a significantly higher flow rate than forward or backward swept blade designs. Furthermore, among other measures to prevent vortices like the rounded rotor hub, the distance between rotor and stator (tip clearance) was increased in order to reduce the problem of tip vortices which plays an important part in the noise emission of axial fans. With its fan blade exactly tailored to ultra low noise application, the NF-S12 series is significantly more quiet than other high end silent fans.

    Mag. Manfred Stadler MBA of the Austrian Institute for Heat-Transmission and Fan Technology (Österreichisches Institut für Wärmeübertragung und Ventilatorentechnik, ÖIWV) about the development of the Noctua Straight-Blade and Raised-Blade-Designs:

    "In the area of PC cooling, the last years saw a growing demand for axial fans with the lowest possible noise emission, which manufacturers mostly met by simply reducing the RPM of existing models without sufficiently adapting the blade geometry and profile to the modified fluid dynamic parameters. The comparison of measured data and simulation outputs showed that the result was an average deficit of efficiency of 10-15%. The complete redevelopment of the blade geometry and profile was carried out with exact fluid mechanical adjustment to minimal noise emission in a speed range of 400-1800RPM at a height of 25mm and a radius of 40 and 60mm. Both fan blades possess 8-12% more flow rate than comparable products at the same total noise emission and static pressure." (Mag. Manfred Stadler MBA, Austrian Institute for Heat-Transmission and Fan Technology (Österreichisches Institut für Wärmeübertragung und Ventilatorentechnik, ÖIWV))


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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