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18 in. Width x 20 in. Height

18" X 20" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 20 5/8" X 22 5/8"] $90.52 USD Out of Stock
18" X 20" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 20 5/8" X 22 5/8"] $85.84 USD Out of Stock
18"w X 20"h Aluminum Exterior Crawlspace Vent - Rain & Waterproof Air Vent With Screen Mesh $61.43 USD Out of Stock
18" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter $58.95 USD Out of Stock
18" x 20" or 20" x 18" Cube Core Eggcrate Return Air Grille $45.89 USD Out of Stock