Attic & Roof Ventilator Base, Compatible Grainger Part Number 2C534, Compatible Manufacturer Model Number TV18G, Finish Galvanized, Flashing Size 20 in x 20 in, For Fan Type Wind-Driven Turbines, Material Galvanized Steel, Throat Diameter 18 in, Base Type Flat, Base Width 30 in, For Use With Flat Roof Mounting Base,18 In. Galvanized, Outlet Diameter 18 in, Overall Height 10 in
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