Attic & Roof Ventilator Base, Compatible Grainger Part Number 4C016, Compatible Manufacturer Model Number TV04G, Finish Galvanized, Flashing Size 20 in x 20 in, For Fan Type Wind-Driven Turbines, Material Galvanized Steel, Throat Diameter 4 in, Base Type Flat, Base Width 14 in, For Use With Flat Roof Mounting Base, 4 In. Galvanized, Outlet Diameter 4 in, Overall Height 10 in
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