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Flow Acceleration Chanels

Boundary layer separation from the suction side of the fan blades leads to increased vortex noise and lower airflow efficiency. In order to suppress this phenomenon, the Noctua’s A-Series impellers feature suction side Flow Acceleration Channels. These channels alter the flow distribution on the suction side of the blades and speed up the airflow at the crucial outer blade regions. As flow separation is more likely to occur when the speed of the fluid relative to the fan blade is low, the increase in speed achieved through the Flow Acceleration Channels leads to significantly reduced flow separation, which permits lower vortex noise and higher airflow efficiency.

Flow Acceleration Channels

28.08.2014 - NH-D15
Test verdict: "Mit dem NH-D15 ist Noctua wirklich ein Meisterwerk gelungen!" (Jens Pressel,

27.08.2014 - NF-S12A FLX
Test verdict: "Bref, une référence absolue dont vous ne pouvez être déçue et que je vous recommande chaudement." (Cadoret Gwenael,

25.08.2014 - NF-S12B redux-1200 PWM
Test verdict: "The Redux fans, are by a significant margin, the best value-for-money cooling product I’ve used and a worthwhile investment." (John Williamson,

23.08.2014 - NA-SRC7
Test verdict: "En definitiva, el set de adaptadores NA-SRC7 es un excelente complemento de la serie redux, que también puede usarse conjuntamente con otros muchos ventiladores de 3 y 4 pines y que desde RealHardTechX animamos a utilizar a los fanáticos del silencio, que nos consta que sois muchos. Recomendado." ((José Romero,