Guard-Mounted Exhaust Fan Assembled Assembled Blade Diameter 12 in Blade Material Aluminum Drive Type Direct Drive Duct Diameter Not Applicable Exhaust Airflow @ 0.000 in SP 830 cfm For Maximum Wall Thickness 6 in For Minimum Wall Thickness 3 in Frame Finish Powder Coated Frame Material Steel Guard Finish Powder Coated Guard Material Steel Guard Type Intake Housing Material Steel Housing Finish Powder-Coated Includes Intake Guard Includes Dehumidistat No Maximum Airflow 830 cfm