Noctua 120 mm case fan NF-A12x25 ULN, 12 V, 1200 RPM, 55.7 m³/h, 0.6 W, 12.1 dB, SSO bearing

The Noctua NF-A12x25 ULN is a 120 mm computer fan engineered for exceptionally quiet and efficient cooling. It combines advanced aerodynamic features—such as the AAO (Advanced Acoustic Optimisation) frame and Flow Acceleration Channels—with a tight 0.5 mm blade tip clearance enabled by the Sterrox® LCP material and a metal-reinforced motor hub. The ULN (Ultra-Low-Noise) variant provides reduced speed settings for near-silent operation while remaining suitable for both airflow-oriented case cooling and pressure-demanding applications like heatsinks and watercooling radiators.

Advantages

The fan offers very low operational noise through slow-speed settings and acoustic optimisation, high precision and durability thanks to a metal-reinforced motor axis and Sterrox® LCP blades, and smooth, long-lasting operation using Noctua’s SSO2 bearing. Its construction yields a balance of airflow and static pressure that makes it effective across a wide range of cooling scenarios. The product includes a comprehensive accessory bundle and is backed by a 6-year manufacturer’s warranty.

Suitable for

• Quiet case cooling where low noise is a priority
• Heatsinks and CPU coolers that require moderate static pressure
• Watercooling radiators needing efficient airflow at low noise levels
• Silent or noise-sensitive workstation and media PC builds

Key specifications

• Model: Noctua NF-A12x25 ULN (MPN: NF-A12x25 ULN, EAN: 9010018100372)
• Fan diameter: 120 mm
• Speed setting: ULN (max ~1200 rpm) with lower fixed-step speeds (e.g., 1200/900 rpm)
• Airflow: 55.7 m³/h (manufacturer data)
• Max static pressure: 0.82 mmH2O (manufacturer data)
• Bearing: SSO2 (self-stabilising oil-pressure bearing)
• Colour: beige / brown

How to use

Mount the fan using the supplied anti-vibration mounts or screws so that airflow orientation matches your cooling needs (intake or exhaust). Connect the 3-pin power cable to a compatible fan header on the motherboard or controller and set the desired low-noise speed profile in BIOS or via a fan controller. When used on heatsinks or radiators, ensure proper spacing and unobstructed airflow to maintain static pressure performance.

Recommendations

For the quietest operation, use the ULN speed setting or a fan curve that keeps RPMs near the 900–1200 rpm range; clean dust filters and radiators regularly to preserve airflow and static pressure efficiency.