Exhaust Fan with Drive Package Assembled Unassembled Blade Diameter 54 in Blade Material Aluminum Drive Type Belt Drive Exhaust Airflow @ 0.000 in SP 33 602 cfm For Cut-Out Height 56 1/2 in For Cut-Out Width 56 1/2 in Frame Finish Zinc Plated Frame Material Steel Guard Type None Includes Drive Package Includes Dehumidistat No Maximum Airflow 33 602 cfm Maximum Noise Level 27 sones