14" X 30" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 16 5/8" X 32 5/8"] Adjustable Return + Product Details Size - 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size - 40"w X 20"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 20 5/8" width X 12 5/8" height

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actual front end outer dimensions are approximately 18 5/8" width X 27 5/8" height

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14" X 30" Steel Return Air Filter Grille for 1" Filter Removable Frame [Outer Dimensions: 16 5 8" X 32 5 8"] Adjustable Return + Product Details Size 4 X 12 Is CRFG2028 Width_14in + Product Details Size 40"w X 20"h is the size for the duct opening measurement only actual front end outer dimensions are approximately 20 5 8" width X 12 5 8" height