16" x 25" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Filter Grille + Product Details Size - 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size - 28"w X 20"h is the size for the duct opening measurement only

+ Product Details Size - 24"w X 12"h is the size for the duct opening measurement only

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actual front end outer dimensions are approximately 27 5/8" width X 22 5/8" height

+ Product Details Size – 6"w X 10"h is the size for the duct opening measurement only

16" x 25" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Filter Grille + Product Details Size 4 X 12 Is CRFG2028 Width_14in + Product Details Size 28"w X 20"h is the size for the duct opening measurement only + Product Details Size 24"w X 12"h is the size for the duct opening measurement only