Fan Noctua NA-FK1 120 mm — 12 V PWM case fan, 1700 RPM, 120.2 m³/h, 25.1 dB

The Noctua NA-FK1 is a second fan kit for the NH-U12S redux CPU cooler that enables a push/pull dual-fan configuration. It includes a second NF-P12 redux-1700 PWM fan, anti-vibration pads, fan mounting clips, a 4-pin PWM y-cable and two Low-Noise Adaptors, providing the components needed to increase cooling efficiency or reduce acoustic levels by running two fans at lower speeds.

Advantages

Adding the NA-FK1 delivers modest but measurable improvements in thermal performance (typically around 1–3°C depending on the load) and allows acoustic fine-tuning by splitting the workload across two fans. The included NF-P12 redux-1700 PWM is the same model used on the NH-U12S redux, ensuring compatibility and balanced airflow. The kit’s anti-vibration pads and mounting clips simplify installation while the y-cable and Low-Noise Adaptors enable both automatic PWM control and lower-speed operation.

Suitable for

• NH-U12S redux users who want a push/pull dual-fan setup
• Systems with higher-end CPUs, heavy turbo usage or overclocking
• Builders seeking lower noise levels through reduced fan speeds

Key specifications

• Contents: NF-P12 redux-1700 PWM fan, anti-vibration pads, fan mounting clips, 4-pin PWM y-cable, two Low-Noise Adaptors
• Fan diameter: 120 mm
• Fan speed range (NF-P12 redux-1700 PWM): approx. 450–1700 RPM (PWM)
• Compatibility: designed for Noctua NH-U12S redux cooler
• Operating voltage: 12 V

How to use

Mount the supplied NF-P12 redux-1700 PWM fan to the NH-U12S redux using the included fan clips and anti-vibration pads to create a push/pull configuration with the pre-installed fan. Connect both fans to the CPU fan header using the provided 4-pin PWM y-cable to allow automatic speed control, or use the Low-Noise Adaptors to lower the maximum fan speed for quieter operation. Ensure the airflow direction matches between the two fans for optimal performance.

Recommendations

For best results, use the NA-FK1 in systems with medium to high thermal loads or when acoustic reduction is required; monitor temperatures after installation to confirm the expected 1–3°C improvement and adjust fan control settings or Low-Noise Adaptors as needed.