34" X 24" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 36 5/8" X 26 5/8"] Compatible With Duct 6in actual front end outer dimensions 4 X 12 Is CRFG2028 Width_14in

actual front end outer dimensions are approximately 28 5/8" width X 12 5/8" height

For a visual guide on how to measure your vent hole before ordering a grille

+ Product Details Size – 30"w X 36"h is the size for the duct opening measurement only

+ Product Details Size – 26"w X 24"h is the size for the duct opening measurement only

+ Product Details Size – 12" X 4" is the size for the duct opening (floor/vent hole) measurement only

34" X 24" Steel Return Air Filter Grille for 1" Filter Removable Frame [Outer Dimensions: 36 5 8" X 26 5 8"] Compatible With Duct 6in actual front end outer dimensions 4 X 12 Is CRFG2028 Width_14in actual front end outer dimensions are approximately 28 5 8" width X 12 5 8" height For a visual guide on how to measure your vent hole before ordering a grille