AC Infinity AIRPLATE S1, Quiet Cooling Fan System 4" with Speed Control, for Home Theater AV Cabinets 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 Adapter increases performance by 25 percent. Dimensions: 4.6 x 4.6 x 1.3 in. | Airflow: 26 CFM | Noise: 17 dBA | Bearings: Dual Ball