25" X 36" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 27 5/8" X 38 5/8"] 18in diameter + Product Details Size – 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size – 34"w X 32"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 20 5/8" width X 28 5/8" height

+ Product Details Size – 18"w X 22"h is the size for the duct opening measurement only

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+ Product Details Size – 34"w X 12"h is the size for the duct opening measurement only

25" X 36" Steel Return Air Filter Grille for 1" Filter Removable Frame [Outer Dimensions: 27 5 8" X 38 5 8"] 18in diameter + Product Details Size – 4 X 12 Is CRFG2028 Width_14in + Product Details Size – 34"w X 32"h is the size for the duct opening measurement only actual front end outer dimensions are approximately 20 5 8" width X 28 5 8" height