In-Line Duct Fan For Fan Type Centrifugal Duct Fan Airflow @ 0.000 in SP 135 cfm Duct Diameter 4 in Motor Output Power 20 W Motor IP Rating IP44 Nameplate Voltage 120V AC Phase 1 Number of Speeds 1 Overall Diameter 8 1/2 in Overall Height 11 in Overall Width 7 1/2 in Application General Purpose High-Efficiency Motor No Housing Material Galvanized Steel Motor Speed 3 000 RPM Includes Ceiling Grilles Mounting Bracket Grille Housings with Damper