120mm PWM case fan EKL Alpenföhn Jetstream 120x120x27, PWM control, 27 mm thickness

EKL Alpenföhn Jetstream 120x120x27 is a 120 mm PWM case fan with a 27 mm thickness designed for PC cooling in compact and standard builds. The fan provides PWM speed control for automatic adjustment of rotational speed, fits standard 120 mm mounts and aims to deliver stable airflow for chassis ventilation, CPU coolers and thin-radiator installations where extra thickness is not acceptable.

Advantages

The 27 mm profile enables installation in tighter spaces while still producing useful airflow. PWM control allows motherboard- or controller-driven automatic speed adjustment to balance cooling performance and noise. The fan's construction focuses on stable rotation and consistent airflow, reducing turbulent noise compared with uncontrolled high-speed fans. Compatibility with common 120 mm mounting points simplifies replacement or upgrade in many systems.

Suitable for

• Chassis ventilation in compact or slim PC cases
• Supplemental airflow for CPU coolers with limited clearance
• Mounting on radiators where reduced depth is required
• System builds that require PWM-based automatic fan speed control

Key specifications

• Frame size: 120 x 120 x 27 mm
• Control: PWM speed control for automatic regulation
• Mounting: Standard 120 mm screw mounting pattern
• Application: Case ventilation, CPU cooler support, radiator compatibility in thin profiles

How to use

Install the fan into a 120 mm mounting location using the four mounting points, ensuring the airflow direction matches your intended cooling path. Connect the fan's PWM cable to a motherboard PWM header or a compatible fan controller to enable automatic speed regulation. Verify clearance around the mounting area to accommodate the 27 mm thickness and secure cables away from the blades before powering the system.

Recommendations

For balanced cooling and acoustics, set the fan header to PWM mode in BIOS or use a fan curve profile so the fan increases speed under load and reduces speed at idle. When using multiple fans, align airflow directions to create consistent intake and exhaust paths and avoid counter-flow configurations. Periodically check for dust buildup and clean as needed to maintain optimal airflow.