Cabinet Supply Fan Assembled Assembled Blade Diameter 54 in Blade Material Steel Drive Type Belt Drive Duct Diameter Not Applicable Exhaust Airflow @ 0.000 in SP 36 830 cfm For Cut-Out Height 61 1/4 in For Cut-Out Width 61 1/4 in Frame Finish Zinc Plated Frame Material Steel Housing Material Steel Housing Finish Galvanized Includes (4) Wall Mounting Angles Includes Dehumidistat No Maximum Airflow 36 945 cfm Maximum Noise Level 31 sones