AC Infinity AI-CFD120SA Dual 120 Quiet Cabinet Fan Kit, for Home Theater AV Amplifier Media Cooling, Silver A complete fan kit designed for cooling and ventilating cabinets that require minimal noise. Features a stainless aluminum frame with a brushed silver finish and detachable filters Can be powered by wall outlet or USB port, a plug adapter is included Each unit contains an additional USB port, up to 4 fans can be daisy chained together to share the same power source (dual units count as 2 fans) Total Size: 11 x 5.75 x 1.5 in | Each Fan: 4.7 x 4.7 x 1 in | Total Airflow: 104 CFM | Total Noise: 26 dBA | Bearings: Dual Ball