Flow Acceleration Channels The NF-A6x25 impeller features suction side Flow Acceleration Channels. By speeding up the airflow at the crucial outer blade regions, this measure reduces suction side flow separation and thus leads to better efficiency and lower vortex noise.
Reduced Motor Hub Size Thanks to its streamlined, compact motor design, the NF-A6x25’s motor hub is smaller than with conventional 6cm fans. This allows for more blade surface area and thus contributes to the NF-A6x25’s superior airflow and pressure performance.
AAO Frame Noctua’s AAO (Advanced Acoustic Optimisation) frames feature integrated anti-vibration pads as well as Noctua’s proprietary Stepped Inlet Design and Inner Surface Microstructures, both of which further refine the fan’s performance/noise efficiency.
Stepped Inlet Design Noctua’s Stepped Inlet Design adds turbulence to the influx in order to facilitate the transition from laminar flow to turbulent flow, which reduces tonal intake noise, improves flow attachment and increases suction capacity, especially in space restricted environments.
Inner Surface Microstructures With the tips of the fan blades ploughing through the boundary layer created by the Inner Surface Microstructures, flow separation from the suction side of the blades is significantly suppressed, which results in reduced blade passing noise and improved airflow and pressure efficiency.
Integrated Anti-Vibration Pads Integrated Anti-Vibration Pads made from extra-soft silicone minimise the transmission of minute vibrations while maintaining full compatibility with all standard mounting systems and fan clips used on heatsinks.
Smooth Commutation Drive 2 The latest version of Noctua’s advanced Smooth Commutation Drive system ensures superb running smoothness by eliminating torque variations and switching noises. This makes the NF-A6x25 remarkably quiet even at very close distance.
SSO2 Bearing The NF-A6x25 features the further optimised second generation of Noctua’s renowned, time-tested SSO bearing. With SSO2, the rear magnet is placed closer to the axis to provide even better stabilisation, precision and durability.
3 speed settings for full flexibility Providing 3000, 2400 and 1600 rpm speed settings via the supplied Low-Noise and Ultra-Low-Noise Adapters, the NF-A6x25 FLX (Flexibility) can be fine-tuned for superior airflow or maximum quietness.
Extensive Cabling Options The fan’s short 20cm primary cable minimises cable clutter in typical applications while the supplied 30cm extension provides extended reach when necessary. Both cables are fully sleeved and the supplied 3:4 pin adaptor allows to connect the fan directly to the power supply.
6 years manufacturer’s warranty Noctua fans are renowned for their impeccable quality and outstanding longevity. Like all Noctua fans, the NF-A6x25 features an MTBF of more than 150.000 hours rating and comes with a full 6 years manufacturer’s warranty.
- by David_W @Dec 18, 2012
A-Series with Flow Acceleration Channels
AAO (Advanced Acoustic Optimisation)
Rotational Speed (+/- 10%)
Rotational Speed with L.N.A. (+/- 10%)
Rotational Speed with U.L.N.A. (+/- 10%)
Airflow with L.N.A.
Airflow with U.L.N.A.
Acoustical Noise with L.N.A.
Acoustical Noise with U.L.N.A.
2.18 mm H2O
Static Pressure with L.N.A.
1.41 mm H2O
Static Pressure with U.L.N.A.
0.61 mm H2O
Max. Input Power
Max. Input Current
> 150,000 h
Low-Noise Adaptor (L.N.A.), Ultra-Low-Noise Adapter (U.L.N.A.), 3 to 4-Pin Adaptor, 30cm Extension Cable, 3 Vibration-Compensators and 4 Fan Screws
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This fan does exactly what I wanted it to do - I bought it as a replacement for the existing rear fans in a Thermaltake Lanbox Lite. They are whisper quiet, and although I doubt it moves the amount of air claimed, it definitely moves considerably more air than the stock fans it replaced. If you are looking for a quiet fan, look no further.
PS: Shipping was excellent. Ordered on sunday evening, they arrived on tuesday.
This fan doesn't emit a steady single "weeee" tone that most fans this size would make. The blades are rather quiet and I do hear a higher tone at low speeds but I don't recognize it is switching drive noise, and its not a problem five feet distance away. With the ULNA inline speed adapter its obviously quiet but not silent to me, yet over the years I have found that larger fans are virtually always quieter respective of moving several times the air volume, and let face it that a big fan will not always fit the application. The wires and adapters all plug in fine.
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