Supply Fan w/Drive Package Assembled Unassembled Blade Diameter 54 in Blade Material Steel Drive Type Belt Drive Exhaust Airflow @ 0.000 in SP 30 129 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 30 129 cfm Maximum Noise Level 17.3 sones