Exhaust Fan Discharge Direction Horizontal and Vertical Duct Diameter 10 in Duct Shape Round Housing Finish Powder-Coated Housing Material Steel Heater Without Heater Includes Speed Control Potentiometer Mounting Location Exterior Sidewall Maximum Airflow 972 cfm Exhaust Airflow @ 0.100 in SP 925 cfm Exhaust Airflow @ 0.000 in SP 972 cfm Number of Speeds Variable Overall Depth 10 in Overall Height 21 1/4 in Overall Width 17 7/8 in Lighted Without Light Phase 1