Noctua NF-A12x25 PWM PC fan Brown, Beige (W x H x D) 120 x 120 x 25 mm

The NF-A12x25 is a highly optimized 120mm fan of the next generation, which sets new record in terms of silent cooling performance thanks to innovative aerodynamic design measures. It combines trend-setting Noctua technologies such as the AAO (Advanced Acoustic Optimization) frame or Flow Acceleration Channels with an unprecedented narrow wheel gap of only 0.5mm. The manufacturing precision required for this is ensured by the use of the new Sterrox® liquid crystal polymer as well as metal reinforcements on the hub and axle support. According to the concept of Noctuas A-series, the NF-A12x25 is a real all-rounder, which shows excellent results in all application areas – no matter whether it concerns flow-performance-oriented applications with low back pressure such as housing ventilation or pressure-oriented scenarios with high air resistance such as the use on coolers and water cooling radiators. The 4-pin PWM version supports fully automatic speed control via PWM connections and is delivered with a low-noise adapter, through which the maximum speed in PWM operation can be reduced from 2000 to 1700rpm. The complete package is rounded off by Noctua's reference class bearing SSO2, as well as a comprehensive accessory package. Its superior efficiency, forward-looking design and uncompromising choice of materials make the NF-A12x25 a real premium product for the highest demands.

Next-generation performance
Noctuas renowned 120mm models such as the NF-F12 and NF-S12A have received more than 400 awards and recommendations from international trade publications and are counted among the best fans on the market. With its even higher efficiency and its innovative, state-of-the-art design, the NF-A12x25 represents a further innovation boost in terms of performance level and manufacturing technology.

Highly optimized P/Q characteristic curve for all applications
The advanced aerodynamic design of the NF-A12x25 enables an extremely strong pressure-output characteristic curve (P/Q), particularly in the critical mid-range. This makes the NF-A12x25 a real all-rounder, which functions excellently in pressure-sensitive as well as in conveyor-power-sensitive applications.

Excellent application acoustics
While many fans produce unpleasant, high-tone running noises as soon as they are mounted in typical applications such as coolers or radiators, the NF-A12x25 has been carefully optimized for an optimum application acoustics: Even with high pressure, the fan impresses with a uniform, pleasant frequency profile and surprisingly low sound pressure levels.

Flow Acceleration Channels
The impeller of the NF-A12x25 is equipped with so-called flow acceleration channels on the suction side. By accelerating the airflow in the critical outer regions of the fan blades, suction-side eddy solutions are reduced, resulting in higher efficiency and a lower turbulence-related noise emission.

Minimum wheel gap
The NF-A12x25 has an unprecedented narrow wheel gap (distance between blade tips and inside frame) of only 0.5mm. This extremely ambitious design represents a new record for 120mm fans and contributes to the superior performance at higher back pressure as on coolers and radiators, because there is less leakage through the gap between rotor and frame.

Metal reinforced hub area
The central hub area of the NF-A12x25 is made entirely of steel and the axle housing has an additional brass reinforcement. The combination of these two measures ensures ultimate precision and even better stability in the critical hub area.

Sterrox® liquid crystal polymer
The rotor of the NF-A12x25 consists of Noctuas novel Sterrox® liquid crystal polymer (LCP), which is characterized by extreme tensile strength, an exceptionally low thermal expansion coefficient as well as an excellent damping characteristic, which is ideal for reducing resonance and vibration phenomena in modern fan blade constructions.

AAO frame system
Noctuas AAO (Advanced Acoustic Optimization) frames have integrated vibration buffers, a stepped inlet design and an internal surface microstructure (Inner Surface Microstructures) that enable even better performance/noise efficiency.

Quilted inlet design
The stepped inlet area of the Stepped Inlet Design creates more turbulence in the supply. This facilitates the transition from laminar flow to turbulent flow, which is better attached to the frame (flow attachment) and thus increases the suction capacity of the fan, especially with a limited suction area.

Inner Surface Microstructures
The inner surface microstructure (Inner Surface Microstructures) creates a boundary layer through which the tips of the fan blades move. This reduces the current separation from the suction side of the blade tips, resulting in a significant reduction of the rotating tone and an increase in the pressure and air flow efficiency.

Integrated anti-vibration pads
The anti-vibration pads made of extra-soft silicone reduce the transmission of minimal vibrations and are also compatible with all commercially available mounting systems and fan clamps used in CPU coolers.

Anti-vibration sealing lip for water cooling radiators
The NF-A12x25 is supplied with a silicone sealing lip which can be used during installation on water cooling radiators and other applications that benefit from a denser termination. The sealing lip helps to absorb minimal vibrations and to reduce leakage currents between the fan and radiator for optimum cooling performance.

SSO2 storage system
The NF-A12x25 is equipped with the further optimized second generation of Noctua's proven SSO storage system. With SSO2 the rear magnet sits closer to the fan axis and thus causes an even better stabilization, which leads to a further improved precision and durability.

Bearing shell made of metal
In order to guarantee the greatest possible degree of manufacturing precision, minimum tolerances and excellent long-term stability, a CNC machined bearing shell made of brass is used.

PWM IC WITH SCD
The fan supports fully automatic speed control via PWM and uses Noctua's specially designed NE-FD1 chip for this purpose. This new PWM IC integrates Noctuas Smooth Commutation Drive (SCD) technology, which minimizes PWM switching noise and makes the fan quieter at low speeds.

Stops at 0% PWM
The fan can be brought to a complete standstill by being controlled by the mainboard or a fan control with a PWM duty cycle of 0%. This makes it ideal for semi-passive systems, which switch off the fans under low thermal load and thus run completely silently.

Smooth Commutation Drive 2
The latest, enhanced version of Noctuas SCD drive system guarantees excellent smoothness by eliminating torque fluctuations and switching noise. This makes the fan itself surprisingly quiet from close up.

Low-noise adapter
The NF-A12x25 PWM is delivered with a (L.N.A.), which reduces the maximum speed from 2000 to 1700rpm. This allows you to operate the fan either with constant 1700rpm or limit the maximum speed in PWM operation.

Comprehensive connection options
While the 20cm short primary cable helps to avoid cable mess in typical applications, the included 30cm extension offers extra range for all cases. Both cables are fully sheathed and a 4-pin Y-cable enables a second PWM fan to be controlled at the same connection.

This text is machine translated.