Reliable electronic motor consumes less power than other comparable inline fans. Includes speed controller for precise airflow. Install using 4" diam. flexible aluminum dryer duct, (2) 4" adjustable worm duct clamps, and zip ties for attaching the fan to the ceiling frame. Duct, clamps, and zip ties not included. 110V. 18W. 60Hz. Max Speed: 5,000 RPM. Max Airflow: 160 CFM (cubic feet per minute). Input Current: 0.27A. Max Current: 0.3A. ELT-certified. NOTE: For indoor use only.