Exhaust Fan Discharge Direction Horizontal and Vertical Duct Diameter 6 in Duct Shape Round Housing Finish Powder-Coated Housing Material Steel Heater Without Heater Includes Speed Control Potentiometer Mounting Location Exterior Sidewall Maximum Airflow 410 cfm Exhaust Airflow @ 0.100 in SP 409 cfm Exhaust Airflow @ 0.000 in SP 410 cfm Number of Speeds Variable Overall Depth 8 in Overall Height 17 in Overall Width 14 1/4 in Lighted Without Light Phase 1