Rosewill Seal, Silent, IP56 Dust Resistant & Splash Proof 120 mm Case Fan RAWR-141209 Fan Size: 120mm Bearing Type: Teflon Nano Bearing Air Flow: 64.75CFM / 45.25CFM Noise Level: 25dBA / 18dBA Noise Cancellation Adapter (NCA) The NCA permit user to switch between 1500RPM and 1000RPM in order to reduce the noise level TNB runs more smoothly with no friction, making the fan silent, powerful and highly durable (200,000hrs)