Rosewill Seal, Silent, IP56 Dust Resistant Splash-Proof 140 mm Case Fan RAWP-141411 Fan Size: 140mm Bearing Type: Teflon Nano Bearing Air Flow: 82CFM / 60.23CFM Noise Level: 21.5dBA / 14.5dBA Noise Cancellation Adapter (NCA) TNB runs more smoothly with no friction, making the fan silent, powerful and highly durable (200,000hrs)