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 1,589 cfm, Frame Finish Galvanized, Frame Material Steel, Guard Type None, Includes Dehumidistat No, Maximum Noise Level 16.4 sones