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be quiet Silent Wings Pro 4 140mm PWM High Speed 2400 RPM Premium Low Noise cooling Fan 4-Pin BL099Silent 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 m3h): 974..