be quiet Fan BL099 Silent Wings Pro 4 140mm PWM Black Retail

SILENT WINGS PRO 4
140mm PWM
Legendary 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
IMPROVED ON ALL LEVELS
Altered blade arrangement for new generation performance
The 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 to none for all possible operations. Be it in a case, on radiators or heat sinks.
OPTIMIZED FOR HIGH-END PERFORMANCE
Minimum distance for maximum air pressure
Silent Wings Pro 4 140mm PWM makes for extraordinary air pressure and therefor, significantly increases the systems performance. The decreased distance between the fan blades and the frame enables an extraordinarily high air pressure. By that, the Silent Wings Pro 4 140mm PWM allows the user to run even the most demanding applications.