Silent Wings Pro 4 PWM, White, 7 Blade, High Pressure, 2400rpm, 97.4CFM, 36.8dB, Fluid Dynamic,4-Pin PWM. Fans 140mm + be quiet! 140mm Silent Wings Pro 4 PWM White Fan. Silent Wings Pro 4 140mm PWM White makes for extraordinary air pressure and therefor, significantly increases the system's performance.
