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 Steel, Throat Diameter 12 in, Base Type Adjustable,...
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 Steel, Throat Diameter 12 in, Base Type Adjustable,...