6" x 20" or 20" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 8.5" X 22.5"] 12in diameter /* Adding space between bullet CRFG2028 Width_14in 4 X 12 Is

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If your duct opening is 14 inches in diameter

+ Product Details Perfect Fit & Easy Sizing - Designed for a 26" x 20" OR 20" x 26" duct opening (measured at the opening)

+ Product Details Size – 12"w X 32"h is the size for the duct opening measurement only

these grilles offer both functionality and aesthetic appeal

6" x 20" or 20" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Aluminum White [Outer Dimensions: 8.5" X 22.5"] 12in diameter * Adding space between bullet CRFG2028 Width_14in 4 X 12 Is * Adding space between bullet points * } * Style for damper link * If your duct opening is 14 inches in diameter