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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
23.10.2014 - SCORE 246 NH-D15
Test verdict: "NH-D15 je nejsilnější vzduchový chladič vůbec, navíc je také jeden z nejtišších na trhu." (Peter Hucík, SCORE 246)
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22.10.2014 - El Chapuzas Informático NF-A4x10 5V
Test verdict: "Los ventiladores Noctua NF-A4/A8/A9 demuestran una vez más el buen hacer de Noctua, pues ofrecen un gran rendimiento con una sonoridad mínima. Además, llegan acompańados de un excelente kit de accesorios, algo de lo que pocas marcas pueden presumir." (Iván Martínez, El Chapuzas Informático)
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21.10.2014 - EnlaceHW.com NF-A4x10 5V
Test verdict: "Los ventiladores A-Series se mantienen fieles al nivel de calidad que uno espera de la marca Noctua. La construcción es excelente y refleja el alto nivel de la mano de obra en su fabricación. La robustez de los diferentes materiales involucrados en el proceso es evidente y se pueden apreciar a través de los detalles del marco del ventilador y hasta en los paneles anti vibraciones."
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21.10.2014 - PCGamers.net.au NH-D15
Test verdict: "The NH-D15 is a great option for those chasing a super quiet rig and builders who don't want to use closed loop water coolers but still want to chase heavy overclocks. It isn't cheap but it's build to last and performs well at a whisper. This is a well finished and thought out cooler and a worthy successor to the iconic NH-D14." (Phil Carroll, PCGamers.net.au)
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