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Stepped Inlet Design

Noctua’s Stepped Inlet Design is an advanced aerodynamic design measure first introduced with the NF-F12 fan. By adding turbulence to the fan’s influx, the Stepped Inlet Design facilitates the transition from laminar to turbulent flow. This measure has an effect similar to the dimple structure of a golf ball in so far as it leads to better flow attachment to the frame, which allows the impeller to suck in more air and hence improves overall airflow efficiency.


Stepped Inlet Design


In addition to these aerodynamic benefits, the Stepped Inlet Design also reduces tonal intake noises caused by laminar inflow due to it being transformed to turbulent flow, which produces a more broadband noise profile. This way, the Stepped Inlet Design helps to refine the fan’s acoustic qualities by letting it blend into the background noise more easily and making it more agreeable to the human ear.


Noctua
30.01.2015 - APHNetworks.com NH-U9S
Test verdict: "When it comes to computer cooling, good things come in Noctua packaging, and the NH-U9S is no different." (Aaron Lai, APHNetworks.com)
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29.01.2015 - hard-h2o.com NF-F12 industrialPPC-2000 PWM
Test verdict: "Noctua se consagra como el número 1 en el terreno de los ventiladores para PC, con varias posibilidades para encontrar el modelo que necesitemos expresamente, con una calidad envidiable y 6 años de garantía." (David Portero, hard-h2o.com)
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29.01.2015 - ThinkComputers.org NH-U9S
Test verdict: "If you are looking for a smaller air cooler for a compact system this cooler is a great choice!" (Bob Buskirk, ThinkComputers.org)
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29.01.2015 - Syndrome-OC.net NF-F12 industrialPPC-2000 PWM
Test verdict: "Noctua nous fait part de deux gamme bien distinctes et qui ont deux publics différents. En effet, la gamme Redux se veut plus grand public avec des vitesses de fonctionnement plus bas et des bruits également plus bas. De son côté, la gamme iPPC se veut plus orientée industrie grâce à la présence de la norme IP 52. Les deux gammes proposent des performances de ce nom tout en étant performantes a des prix plutôt attractifs. La gestion PWM est également un plus pour ceux voulant un bruit faible provenant de sa tour." (Batiste Hocq, Syndrome-OC.net)
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