Exhaust Fan with Drive Package Assembled Unassembled Blade Diameter 30 in Blade Material Steel Drive Type Belt Drive Exhaust Airflow @ 0.000 in SP 11 169 cfm For Cut-Out Height 32 1/2 in For Cut-Out Width 32 1/2 in Frame Finish Zinc Plated Frame Material Steel Guard Type None Includes Drive Package Includes Dehumidistat No Maximum Airflow 9 829 cfm Maximum Noise Level 18.3 sones