16" X 20" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 18 5/8" X 22 5/8"] w20h20 + Product Details Size - 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size - 24"w X 34"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 12 5/8" width X 36 5/8" height

actual front end outer dimensions are approximately 20 5/8" width X 18 5/8" height

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

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

16" X 20" Steel Return Air Filter Grille for 1" Filter Removable Frame [Outer Dimensions: 18 5 8" X 22 5 8"] w20h20 + Product Details Size 4 X 12 Is CRFG2028 Width_14in + Product Details Size 24"w X 34"h is the size for the duct opening measurement only actual front end outer dimensions are approximately 12 5 8" width X 36 5 8" height