The Tjernlund Dryer Duct Booster® allows homeowners to dry their clothes faster, prevent lint buildup and prevent dryer fires. Dryers are often installed in areas of homes where they cannot work effectively, leading to longer drying times, high energy use and lint buildup in ductwork. The Dryer Duct Booster eliminates these issues. U.S.A. Dimensions L x W x H (in.): 14 x 10 x 10 3/4, Color: Chrome, Auto On/Off: Yes, Mounting Hardware Included: Yes Highly recommended for homes with dryer exhaust duct run of 25 feet or more Lint Blitzer™ impeller repels lint Permanently lubricated motor is positioned outside of air stream for maximum motor life Easy installation in both horizontal and vertical ducts Maintains proper exhaust velocities in duct runs up to 100 equivalent feet, optimizing dryer performance