The Noctua NF-A12x25 FLX is a state-of-the-art 120 mm fan optimized for analog voltage-based speed control. Built with Noctua’s groundbreaking Sterrox® liquid-crystal polymer material and equipped with an SSO2 bearing, it offers incredibly tight tip clearance for superior airflow and pressure performance. Engineered for silent computing, it supports three speed profiles via bundled Low-Noise and Ultra-Low-Noise adapters, making it ideal for cases, heatsinks, or radiators in low-noise builds.

Key Features:

Sterrox® LCP impeller with 0.5 mm tip clearance for maximum efficiency

FLX version supports voltage-controlled speed tuning with 3-pin header

Includes L.N.A. and U.L.N.A. for three acoustic performance levels

SSO2 bearing system for near-silent operation and extended reliability

Flow Acceleration Channels and stepped inlet design for aerodynamic optimization

Specifications:

Dimensions: 120 x 120 x 25 mm

Weight: 210 g

Materials: Sterrox® LCP (impeller), fiberglass-reinforced PBT (frame)

Speed Settings:

• Max: 2000 RPM

• L.N.A.: 1700 RPM

• U.L.N.A.: 1350 RPM

Airflow: Up to 102.1 m³/h
Noise Level:

• Max: 22.6 dB(A)

• U.L.N.A.: 12.1 dB(A)

Static Pressure: 2.34 mm H₂O

Bearing: SSO2 (Self-Stabilising Oil-pressure Bearing)

Input Power: 1.68 W
Voltage: 12 V
Connector: 3-pin
MTTF: >150,000 hours

Connectivity / Compatibility:

• Compatible with all 3-pin fan headers and fan controllers

• Designed for quiet chassis cooling, heatsinks, or low-noise modded airflow setups

Additional Features:

• Low-Noise Adapter (L.N.A.) and Ultra-Low-Noise Adapter (U.L.N.A.) included

• 30 cm extension cable

• Integrated anti-vibration pads and 4-pin OmniJoin™ adapters for compatibility with custom connectors

Customer Benefits:
Perfect for analog fan controllers or fixed-voltage fan headers, the NF-A12x25 FLX offers premium performance and ultra-quiet operation without needing PWM. It’s ideal for audiophile PCs, passively-cooled systems, and anyone seeking precise acoustic control.

What’s in the Box:

1x NF-A12x25 FLX 120 mm Fan

1x Low-Noise Adapter (L.N.A.)

1x Ultra-Low-Noise Adapter (U.L.N.A.)

1x 30 cm Extension cable

4x Vibration-compensating mounts

4x Fan screws

User manual

Compliance:
This product meets all applicable European and international standards (CE, RoHS, REACH, WEEE). It has been designed and tested for maximum safety, performance, and environmental responsibility.

Manufacturer Contact:
Company Name: Noctua GmbH
Address: Lastenstraße 19, 4020 Linz, Austria
Email: support(at)noctua(dot)at