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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
23.07.2014 - ReviewTech.co.uk NH-D15
Test verdict: "The Noctua NH-D15 is an excellent, if not the best product currently available in the air cooling category" (Andrew James, ReviewTech.co.uk)
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21.07.2014 - RealHardTechX.com NF-S12B redux-1200 PWM
Test verdict: "En definitiva, un producto absolutamente recomendado." (José Romero, RealHardTechX.com)
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21.07.2014 - bcchardware.com NH-U12S
Test verdict: "Noctua has set the bar pretty high for themselves, and like usual, they've been able to live up to their legacy with the NH-U14S and NH-U12S CPU coolers." (Jason Schneider, bcchardware.com)
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21.07.2014 - ProfesionalReview.com NF-A14 industrialPPC-2000 PWM
Test verdict: "Estamos ante una serie que trae un soplo de aire fresco a la marca con nuevos colores, un rendimiento bastante bueno en todos los casos para el ruido generado si los usamos para las aplicaciones correctas, 6 años de garantía, y con la seguridad de una marca que responde bien ante cualquier problema." (Miguel Ángel Navas Carrera, ProfesionalReview.com)
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