Attic & Roof Ventilator Base, Compatible Grainger Part Number 2C531, Finish Galvanized, Flashing Size 20 in x 20 in, For Fan Type Wind-Driven Turbines, Includes 20 in x 20 in Flashing, Material Galvanized Steel, Throat Diameter 12 in, Base Type Adjustable, Roof Pitch Range 0:12 to 7:12, Base Width 20 in, For Use With 12 in Turbine Ventilators, Outlet Diameter 12 in, Overall Height 7 in
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