Enermax Marathon 120mm Silent PC Case Fan - UC-12EB Exclusive ENLOBAL bearing with magnetic-barometric design to run friction-free and noiseless Nano-technology for lowest abrasion and highest durability Detachable fan blades for cleaning Best wire management and 3 to 4 pin adapter Noise level (dBA):17; Airflow (CFM);44; Speed range (RPM):1000  10%