Features:

• Size (Form factor): 120 x 120 x 25 mm (square)
• Speed range: 0 – 1800 rpm
• Airflow (max.): 107.3 m³/h (63.15 CFM)
• Acoustical noise (max.): 22.5 dB(A)
• Static pressure (max.): 3.14 mm H₂O
• Rated voltage: 12 V
• Connector: 4-pin
• Frame shape: Square
• Mounting hole spacing(s): 105 x 105 mm
• Material frame: PBT ABS GF30
• Material impeller: LCP GF30
• Material anti-vibration pads: Silicone rubber
• Bearing: SSO2
• Rotational direction: Counter-clockwise
• Connector type: A2543-4PIN (or equal)
• Wire: 26 AWG
• Sleeving: Fibreglass silicone mesh
• Rotational speed (max.): 1800 rpm
• Rotational speed with LNA (max.): 1500 rpm
• Rotational speed @ 20% PWM: 360 rpm
• Acoustical noise (max.): 22.5 dB(A)
• Acoustical noise with LNA (max.): 18.1 dB(A)
• Airflow (max.): 107.3 m³/h (63.15 CFM)
• Airflow with LNA (max.): 87.2 m³/h (51.32 CFM)
• Static pressure (max.): 3.14 mm H₂O
• Static pressure with LNA (max.): 1.71 mm H₂O
• Operating temperature: -10°C to +60°C
• Operating humidity: 15 – 90 %
• Storage temperature: -20°C to +65°C
• Storage humidity: 15 – 90 %

Next-generation performance

Building upon the success of the original NF-A12x25, the G2 version introduces a refined blade geometry and a novel motor design. These advancements lead to a significant boost in performance-to-noise efficiency, allowing the NF-A12x25 G2 to achieve superior results across various applications, including water cooling radiators, heatsinks, and case fan setups.

Highly optimised P/Q curve for all applications

The NF-A12x25 G2’s sophisticated aerodynamic design allows for a pressure to airflow (P/Q) curve that is extremely strong in the critical mid-section. This means that the NF-A12x25 G2 is a true jack-of-all-trades with excellent performance in both static pressure demanding and airflow demanding applications.

Excellent on-application acoustics

While many fans produce unpleasant, high-pitched noises when installed in typical applications such as on heatsinks or radiators, the NF-A12x25 G2 has been carefully fine-tuned for optimal on-application acoustics. It produces a smooth, pleasant frequency profile and surprisingly low sound pressure levels (SPL) when working against back pressure.

Progressive-Bend impeller

The NF-A12x25 G2 features a unique Progressive-Bend impeller with Flow Acceleration Channels and winglets. Its nine blades are swept backwards close to the hub and progressively bent forward further out. Working in tandem with the Centrifugal Turbulator hub, this design not only helps to push more air towards the outer blade areas where efficiency is higher but also assures maximum lift and near uniform loading across the entire blade span.

Centrifugal Turbulator hub

Acting as a turbulator, the new Centrifugal Turbulator hub design improves flow attachment in the hub region. At the same time, its centrifugal driving motion pushes air outwards from the hub area where efficiency is low due to the slow rotational speed towards the outer, high-efficiency zones of the blades, thereby increasing overall efficiency by optimising fluid distribution across the impeller area.

Flow Acceleration Channels

The NF-A12x25 G2 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.

Winglets

Winglets can help to reduce tip vortices that are caused by the pressure differential between the suction and the pressure side of fan blades but bear the risk of reducing efficiency due to extra fluid displacement in high velocity regions. The NF-A12x25 G2’s small winglets have been carefully fine-tuned to provide consistent efficiency gains working in tandem with its Progressive Bend blade geometry, Flow Acceleration Channels and AAO frame.

Ultra-tight tip clearance

The NF-A12x25 G2 has an extremely tight tip clearance (distance between the blade tips and the inside of the frame) of only 0.5mm. This highly ambitious design helps the NF-A12x25 G2 to work more efficiently against back pressure, such as on heatsinks or radiators, by reducing leak flows through the gap between impeller and frame.

Sterrox liquid-crystal polymer compound

The NF-A12x25 G2’s impeller is made from Noctua’s novel Sterrox® liquid-crystal polymer (LCP) compound that features extreme tensile strength, an exceptionally low thermal expansion coefficient and damping characteristics that are ideal for reducing resonance and vibration phenomena in advanced fan-blade designs.

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 screws and other mounting systems.

Anti-vibration gasket for water cooling radiators

The NF-A12x25 G2 includes an NA-AVG1 silicone gasket that can be used when installing the fan on water cooling radiators or other applications that benefit from a tighter seal with the fan. The gasket helps to damp minute vibrations and to reduce air loss between the fan and the radiator for optimal cooling performance.

Intake side spacer for suction applications (available separately)

If space allows, the NF-A12x25 G2 can be combined with the optional NA-IS1-12 inlet side spacer to reduce influx turbulences in “pull” type applications where the fan draws air through a grill, mesh filter or perforated panel. In many configurations, this reduction in turbulence can enhance airflow performance and further improve the fan’s suction acoustics.

SSO2 bearing

The NF-A12x25 G2 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.

Metal bearing shell

In order to guarantee the highest possible degree of manufacturing precision, minimum tolerance and excellent long-term stability, the NF-A12x25 G2 sports a CNC milled bearing shell made entirely from brass.

etaPERF motor with NE-FD6 PWM IC

Noctua’s new etaPERF motor sets new standards in energy efficiency thanks to its extremely low electric impedance and the latest NE-FD6 drive system with its integrated, ultra-sensitive Hall effect sensor that provides super-precise commutation performance. This not only enables it to convert a minimal electric input into a maximum power-output with hardly any losses, but also works in tandem with Noctua’s proven Smooth Commutation Drive 2 technology to make the etaPERF motor run near-inaudible.

SupraTorque

Most fans become slightly slower when working against back pressure such as on heatsinks and radiators, which results in reduced performance. Enabled by the new NA-FD6 driver IC, Noctua’s SupraTorque™ technology allows the fan to leverage additional torque headroom when required in order to keep its RPM speed at the desired level no matter the airflow resistance, ensuring consistent performance even in the most demanding conditions.

PWM control with wide speed range

The NF-A12x25 G2 PWM can be PWM-controlled from its maximum speed of 1800rpm all the way down to 360rpm. This makes it possible to adjust the fan for maximum performance or near-silent operation using either automatic, temperature-based motherboard speed control or manual controllers such as the NA-FC1.