Exhaust/Supply Fan Assembled Unassembled Blade Diameter 36 in Blade Material Aluminum Drive Type Belt Drive Exhaust Airflow @ 0.000 in SP 11 037 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 11 037 cfm Maximum Noise Level 18 sones