Anti Stall Knobs
The NF-S12A features Anti-Stall Knobs close to the trailing edges of the fan blades. By speeding up the air at this critical point of the blade profile, the Anti-Stall Knobs reduce the risk of undesired stall and flow separation phenomena
This means that the NF-S12A works more efficient than its predecessors in most mid- to high impedance situations despite its slightly lower maximum pressure: While providing a bit less static pressure at the shut off point, the NF-S12A produces more pressure throughout most of the curve, making it better suited for all-round use, tight air filters or even heatsinks and radiators:
Comparing the NF-S12A’s performance curve to its predecessor’s, the improved stall margin is immediately visible: Thanks to the suppression of the stall effect, the dent in the curve occurs much later and less pronounced than with the NF-S12B. Combined with its higher maximum airflow in free flow and further reduced noise emission, this allows the NF-S12A to achieve even better results than its renowned predecessor.
And there you have it folks, a great follow up on the old model, it is in line with the new line of fans like the Noctua NF14 series we reviewed a while back.
So in short, what can I say… It’s proper Noctua quality as we are used with added new innovations with every new design they bring out, bringing great airflow with minimal noise, and doing it reliable they are build to last (I still use 5 year old Noctua fans) 6 years warranty. They are a bit more expensive than your “regular” fans but they worth every single penny.
