Scythe S-Flex 120mm Fan, 1600 RPM (SFF21F) Fan Speed: 1600 RPM, Noise Level: 28 dBA, Airflow: 63.7 CFM Rated Voltage: 12V Bearing Type: Sony Fluid Dynamic Bearing MTBF: 150,000 hours @ 25C Connector: 3-Pin (4-Pin adapter included)