
NF-A12x25 FLX
High-efficiency quiet 120mm fan
Pioneering design
With Sterrox® LCP & record tight 0.5mm tip clearance
Highly optimised P/Q curve
For outstanding performance in all applications
3-pin FLX version
Provides 2000/1700/1350rpm speed settings via Low-Noise Adaptors

Sterrox® liquid-crystal polymer compound
The NF-A12x25’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.

Ultra-tight tip clearance
The NF-A12x25 has a record tight tip clearance (distance between the blade tips and the inside of the frame) of only 0.5mm. This highly ambitious design sets a new benchmark for 120mm fans and helps the NF-A12x25 to work more efficiently against back pressure, such as on heatsinks or radiators, by reducing leak flows through the gap between impeller and frame.

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

Highly optimised P/Q curve for all applications
The NF-A12x25’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 is a true jack-of-all-trades with excellent performance in both static pressure demanding and airflow demanding applications.

Further resources
Want to know more on this topic? Explore relevant articles and resources.

NF-A12x25: technical backgrounds and manufacturing challenges
From material limitations to microscopic tolerances, the NF-A12x25 was one of Noctua's most challenging projects to date. But how did they overcome these obstacles?

NF-A12x25: performance comparison to NF-F12 and NF-S12A
See how the NF-A12x25 stacks up against the NF-F12 and NF-S12A in airflow, pressure, and real-world performance.

NF-A12x25: interview with Lars Strömbäck (Noctua CTO)
The NF-A12x25 took over four years to develop, pushing Noctua’s R&D to new heights. Noctua’s CTO shares the innovations that make it a breakthrough in fan design.

Sterrox® liquid-crystal polymer (LCP)
Sterrox® LCP minimizes impeller creep, dampens vibrations, and improves acoustic performance, making Noctua fans quieter and more efficient.
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