Legendary silence, epic performance and features
Silent Wings Pro 4 120mm PWM White is the most progressive, performant and versatile fan by be quiet!

Optimized fan blades for the highest performance on radiators and heat sinks
Speed switch allows changing maximum PWM speed between medium-speed, high-speed and ultra-high-speed (up to 3000 rpm)
Small tip clearance and a fan frame with a funnel-shaped air outlet for extremely high air pressure
Virtually inaudible operation at regular speed
6-pole fan motor and fluid-dynamic bearing for less vibration and very smooth operations
Individual mounting systems for use as a case fan or with a radiator