Exhaust Fan with Drive Package Assembled Unassembled Blade Diameter 36 in Blade Material Aluminum Drive Type Belt Drive Exhaust Airflow @ 0.000 in SP 14 345 cfm For Cut-Out Height 38 1/2 in For Cut-Out Width 38 1/2 in Frame Finish Zinc Plated Frame Material Steel Guard Type None Includes Drive Package Includes Dehumidistat No Maximum Airflow 14 345 cfm Maximum Noise Level 19.7 sones