12" X 20" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 14 5/8" X 22 5/8"] Color_R-4.2 Yellow + Product Details Size - 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size - 18"w X 6"h is the size for the duct opening measurement only

+ Product Details Size - 10"w X 32"h is the size for the duct opening measurement only

+ Product Details Size - 25"w X 34"h is the size for the duct opening measurement only

Actual Filter Size – 11 3/4"w x 19 3/4" x 1"

background-color: #000

12" X 20" Steel Return Air Filter Grille for 1" Filter Removable Frame [Outer Dimensions: 14 5 8" X 22 5 8"] Color_R 4.2 Yellow + Product Details Size 4 X 12 Is CRFG2028 Width_14in + Product Details Size 18"w X 6"h is the size for the duct opening measurement only + Product Details Size 10"w X 32"h is the size for the duct opening measurement only