Silent Wings 4 PWM Highspeed, 7 Blade, 1900rpm, 78.4CFM, 29.3dB, Fluid Dynamic, 4-Pin PWM. Fans 140mm + be quiet! 140mm Silent Wings 4 PWM Highspeed Fan. A 6-pol-motor and anti-vibration mountings combined with fan blades optimized for maximum airflow make Silent Wings 4 140mm PWM high-speed the perfect choice for the most demanding applications in high-end systems.
