Noctua NL-ACF1 80mm Brown PWM Fan

The Noctua NL-ACF1 80mm Brown PWM Fan is designed as a magnetic snap-on fan to pair with NL-LC1 series liquid coolers fan pumps, providing additonal airflow to near-socket components. Featuring the highly efficient NF-A8 impeller, PWM speed, and an ultra quiet max-loudness rating of 17.7 dB(A), the Noctua NL-ACF1 delivers quiet, efficient cooling making it an elite choice even for the highest demands.

Features

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NL-ACF1 Auxiliary Cooling Fan

The NL-ACF1 is an auxiliary cooling fan for Noctua’s NL-LC1 series all-in-one liquid coolers. Installed on top of the CPU block, it provides extra cooling for VRMs, RAM, M.2 SSDs and other near-socket components.

Its large, highly optimised NF-A8 impeller delivers significantly more airflow at lower noise levels compared to smaller VRM fans. Leveraging the Coandă effect, the NL-ACF1’s outer frame has been custom-designed in order to draw as much air out towards the components as possible.

The fan can be easily adjusted from near-silent operation to maximum cooling via PWM, either at a fixed speed setting or through automatic control by the motherboard. Attaching magnetically to the top of the CPU block, it is extremely straightforward to install.

In sum, the NL-ACF1 is a perfect add-on for Noctua NL-LC1 series coolers that are running in systems that could benefit from extra airflow over near-socket components.

• Airflow for near-socket components: Provides extra cooling for VRMs, RAM, M.2 SSDs and other parts
• Ultra-quiet 80mm fan: High performance at minimal noise levels, easy to control via PWM
• For Noctua NL series coolers: Compatible with NL-LC1 liquid coolers

Extra Cooling for Near-Socket Components

With liquid coolers, there is typically less air movement around the CPU socket than with air coolers, which can cause higher temperatures on near-socket components such as voltage regulator modules (VRMs), RAM modules or M.2 SSDs. The NL-ACF1 solves this problem by providing extra airflow to the entire area around the CPU socket.

Coandă Effect for Maximum Efficiency

The NL-ACF1 combines the proven NF-A8 impeller with a custom-designed fan frame that leverages the Coandă effect, the phenomenon that fluid streams have a tendency to stay attached to surfaces, to draw airflow out towards the sides as much as possible.

Large Diameter NF-A8 Fan

Many liquid coolers use 40 or 50mm VRM fans that produce high-pitched noises and are hidden underneath a cover, hampering airflow. By contrast, the NL-ACF1 leverages an 80mm size impeller that’s completely uncovered, which ensures both superior airflow and quieter operation with a more pleasant, lower-pitched sound signature.

Magnetic Attachment

Installing the NL-ACF1 couldn’t be easier: Thanks to the integrated magnets at the base of the fan, it simply snaps onto the NL-PNA1 pump noise absorber of Noctua’s Asetek Emma V2 based NL-LC1 liquid coolers.

Compatible with NL-LC1 Coolers

The NL-ACF1 is compatible with all size variants of Noctua’s Asetek Emma V2 based NL-LC1 series liquid coolers (NL-LC1-24, NL-LC1-36, NL-LC1-42), replacing the faceplate that comes pre-installed on the pump noise absorber.

Flow Acceleration Channels

The NL-ACF1 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.

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.

PWM Control

The NL-ACF1 supports PWM control, so you can easily adjust it from near-silent operation to maximum airflow delivery depending on your requirements. Whether you want to control the fan manually or automatically, in sync with a pump and other fans or independently – anything is possible!

SSO2 Bearing

The NL-ACF1 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.

Custom-Designed PWM IC with SCD

Supporting fully automatic PWM speed control, the NL-ACF1 uses Noctua's novel, custom-designed NE-FD1 PWM IC that integrates Smooth Commutation Drive (SCD) technology. By providing smoother torque impulses, SCD suppresses PWM switching noises and thus makes the fan quieter at low speeds.

Stops at 0% PWM

When the fan is set to 0% PWM duty cycle by the motherboard or PWM fan controller, it will stop. This makes it ideal for creating setups with semi-passive cooling that automatically turn the fans off and thus run completely silent at idle if thermals allow.

6-Year Manufacturer’s Warranty

Noctua fans are renowned for their impeccable quality and outstanding longevity. Like all Noctua fans, the NL-ACF1 features an MTTF rating of more than 150,000 hours and comes with a full 6-year manufacturer’s warranty.