Exhaust Fan Assembled Assembled Blade Diameter 12 in Blade Material Aluminum Drive Type Direct Drive Duct Diameter 12 1/4 in Exhaust Airflow @ 0.000 in SP 1 450 cfm Frame Finish Galvanized Frame Material Steel Guard Finish Zinc Plated Guard Material Steel Guard Type Intake Includes Dehumidistat No Maximum Noise Level 11.7 sones