AC Infinity AIRPLATE S9, Quiet Cooling Fan System 18" with Speed Control, for Home Theater AV Cabinet Cooling An ultra-quiet fan system designed for cooling cabinets that requires minimal noise. Features a multi-speed controller to set the fans speed to optimal noise and airflow levels. Contains a CNC machined aluminum frame with a modern brushed black finish. Powered by wall outlet or USB port, included Turbo Wall Adapter increases performance by 25%. Dimensions: 17.5 x 6.1 x 1.3 in. | Total Airflow: 156 CFM | Total Noise: 21 dBA | Bearings: Dual Ball