25" X 12" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 27 5/8" X 14 5/8"] 18" Diameter actual front end outer dimensions 4 X 12 Is CRFG2028 Width_14in

actual front end outer dimensions are approximately 31 5/8" width X 24 5/8" height -

But they are also the most visible representation of you air system

+ Product Details Size - 30"w X 32"h is the size for the duct opening measurement only

+ Product Details Size - 25"w X 28"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

25" X 12" Steel Return Air Filter Grille for 1" Filter Fixed Hinged [Outer Dimensions: 27 5 8" X 14 5 8"] 18" Diameter actual front end outer dimensions 4 X 12 Is CRFG2028 Width_14in actual front end outer dimensions are approximately 31 5 8" width X 24 5 8" height But they are also the most visible representation of you air system