Thermalright TY-147A 140 mm, PWM fan, low noise emission. TY-147A Length 151mm x Width 26.5mm x Height 141mm TY-147A Fan Speed: 300~1300 RPM (PWM) TY-147A Fan noise level: 21~25dBA Fan Airflow: 17-74CFM PWM fan with 7 high efficient, low noise emssion fan blades.