6" x 28" or 28" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 8.5" X 30.5"] Outdoor Vent Covers + Product Details Size - Product Details Size Adjustable SV2414 HP R-6.0 insulation

+ Product Details Size - 28"w X 28"h is the size for the duct opening measurement only

+ Product Details Size - 34"w X 28"h is the size for the duct opening measurement only

If you are looking to enhance your project with a top-of-the-line unit

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+ Product Spec Sheet Corner Baseboard Grille Spec Sheet

6" x 28" or 28" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Aluminum White [Outer Dimensions: 8.5" X 30.5"] Outdoor Vent Covers + Product Details Size Product Details Size Adjustable SV2414 HP R 6.0 insulation + Product Details Size 28"w X 28"h is the size for the duct opening measurement only + Product Details Size 34"w X 28"h is the size for the duct opening measurement only