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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
01.07.2015 - GameTechModding.com NH-D15S
Test verdict: "Prodotto ottimo!" (Enrico Luperini, GameTechModding.com)
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01.07.2015 - NextHardware.com NH-C14S
Test verdict: "Design sofisticati, materiali eccelsi e prestazioni da far impallidire la concorrenza sono ormai una costante in ognuno dei dissipatori targati Noctua. Ed i nuovi NH-D15S e NH-C14S non sono da meno grazie a strutture davvero robuste ed efficienti e a ventole estremamente performanti e silenziose." (Alfonso Basilicata, NextHardware.com)
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30.06.2015 - Play3r.net NH-D15S
Test verdict: "The bottom line is that the Noctua NH-D15S is a solid performer, as well as offering fantastic compatibility which is aimed to “help” enthusiasts and consumers with large memory heatsinks, as well as PCIe slots;" (Gavin Bonshor, Play3r.net)
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30.06.2015 - DVTests.com NF-S12B redux-1200 PWM
Test verdict: "With this airflow and static pressure measured through the tests, the fan is definitely capable to deliver astonishing cooling performance, which will be able to keep every processor cool and stable, while being cooled by a CPU cooler or water radiator compatible with 120 mm fans." (Dobrin Krastev, DVTests.com)
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