Exhaust Fan Assembled Assembled Blade Diameter 24 in Blade Material Aluminum Drive Type Direct Drive Duct Diameter 24 1/2 in Exhaust Airflow @ 0.000 in SP 4 240 cfm Frame Finish Galvanized Frame Material Steel Guard Finish Zinc Plated Guard Material Steel Guard Type Intake Includes Dehumidistat No Maximum Noise Level 17.2 sones