The Grainger Approved Register Booster Fan is a 6 inch diameter duct fan designed to boost airflow from registers. It features steel construction with a baked enamel finish, thermally protected PSC motor, and plug-in cord. This fan can move up to 190 CFM and has adjustable speed settings. It measures 7 inches deep x 9 inches high. This booster fan is ideal for increasing airflow from floor registers or wall registers.