120 mm 3 Pack Computer Case Fans with fan hub. Sickle fan blade design: increase air volume and reduce noise. MAX air volume: 51.56 CFM. MAX fan noise: 23.5 dB. PWM automatic temperature control: 4pin PWM interface, mainboard automatic speed regulation, fan speed 1200 RPM±10%. With anti-vibration gaskets: reduce resonance noise, reduce fan vibration, and enhance installation stability.