Milliard 4-Inch Inline Blower Fan Multi-purpose. Use it with any 4in. fitted air duct system. Great for home & garden use. Designed for use in the Milliard Hydroponic Grow Tent with the Milliard 4in. air duct and Milliard Inline Carbon Filters. Included mounting brackets and 6ft. long power cord for extending airflow to remote areas. Heavy-duty metal construction. Molded impeller can move over 200 cu. ft. of air per min!