be quiet! Silent Wings Pro 4 140mm PWM High Speed - Fan

SILENT WINGS PRO 4 - 140mm PWMLEGENDARY SILENCE, EPIC PERFORMANCE AND FEATURES Silent Wings Pro 4 140mm PWM 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 2400 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- 5-year manufacturer warranty More IMPROVED ON ALL LEVELSAltered blade arrangement for new generation performanceThe fan blades are what makes a fan. It is for this reason that the fan blades of Silent Wings Pro 4 140mm PWM have been developed newly from scratch. The new blade arrangement enables a performance second