34" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Curved Blade Steel + Product Details Size - 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size - 18"w X 34"h X 2"d (for duct opening measurement only)

+ Product Details Size – 16"w X 28"h is the size for the duct opening measurement only

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+ Product Details Perfect Fit & Easy Sizing - Designed for a 6" x 20" or 20" x 6" duct opening (measured at the opening)

+ Product Details Size – 26"w X 16"h is the size for the duct opening measurement only

34" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Curved Blade Steel + Product Details Size 4 X 12 Is CRFG2028 Width_14in + Product Details Size 18"w X 34"h X 2"d (for duct opening measurement only) + Product Details Size – 16"w X 28"h is the size for the duct opening measurement only