The be quiet! Silent Wings Pro 4 is a high-performance 140mm PWM case fan designed for silent operation and efficient cooling in your computer system. With advanced technology and a unique design, it ensures optimal airflow while keeping noise levels to a minimum.

• High-quality fluid-dynamic bearing for longevity
• Optimized fan blade design for increased airflow
• Variable speed control (PWM) for dynamic cooling
• Extremely quiet operation even at high speeds
• Robust construction with anti-vibration mounts