Thermalright TY-141 140 mm, 2 ball bearing fan, low noise emission. TY-141 Length 151mm x Width 26.5mm x Height 141mm TY-141 Fan Speed: 900~1300 RPM (PWM) TY-141 Fan noise level: 21~25dBA Fan Airflow: 28-74CFM 2 ball bearing fan with 7 high efficient, low noise emssion fan blades.