Cabinet Supply Fan Assembled Assembled Blade Diameter 24 in Blade Material Steel Drive Type Belt Drive Duct Diameter Not Applicable Exhaust Airflow @ 0.000 in SP 4 988 cfm For Cut-Out Height 29 1/4 in For Cut-Out Width 29 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 4 977 cfm Maximum Noise Level 15.1 sones