Silent Wings Pro 4 140mm PWM is the most progressive, performant and versatile fan by be quiet! Model: Silent Wings Pro 4 140mm PWM Connector: 4-pin PWM Dimensions (mm): 140 Fan speed @ 100% PWM / 12V (rpm): 2400 Air Flow @ 100% PWM / 12V (CFM / m3/h): 97.41 / 165.5 Air Pressure @ 100% PWM / 12V (mm H2O): 3.64 Noise level @ 100% PWM / 12V (dB(A)):36.8 Cable length (mm): 500 Dimensions (L x W x H), (mm): 140 x 140 x 25 Bearing technology: FDB Motor technology: 6-pole fan motor Weight incl. fixed cables (kg): 0.258

6-pole fan motor and fluid-dynamic bearing for less vibration and very smooth operations. Virtually inaudible operation at regular speed. Small tip clearance and a fan frame with a funnel-shaped air outlet for extremely high air pressure. Speed switch allows changing maximum PWM speed between medium-speed, high-speed and ultra-high-speed (up to 2400 rpm). Optimized fan blades for the highest performance on radiators and heat sinks.