An ultra-quiet UL-certified fan system designed for cooling cabinets that requires minimal noise., Features a multi-speed controller to set the fan’s 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%., Dimensions: 8.5 x 4.4 x 1.3 in. | Total Airflow: 52 CFM | Total Noise: 18 dBa | Bearings: Dual Ball