Supply Fan w/Drive Package, Assembled Unassembled, Blade Diameter 20 in, Blade Material Steel, Drive Type Belt Drive, Exhaust Airflow @ 0.000 in SP 4, 587 cfm, For Cut-Out Height 22 1/2 in, For Cut-Out Width 22 1/2 in, Frame Finish Zinc Plated, Frame Material Steel, Guard Type None, Includes Drive Package, Includes Dehumidistat No, Maximum Airflow 4, 587 cfm, Maximum Noise Level 19.7 sones