32" X 30" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 34 5/8" X 32 5/8"] 18in diameter + Product Details Size – 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size – 18"w X 12"h is the size for the duct opening measurement only

+ Product Details Size – 16"w X 34"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 32 5/8" width X 14 5/8" height

+ Product Details Size - 32"w X 6"h is the size for the duct opening measurement only

Tailored for Your Needs: Specifically suited for 24x24 lay-in diffusers

32" X 30" Steel Return Air Filter Grille for 1" Filter Removable Frame [Outer Dimensions: 34 5 8" X 32 5 8"] 18in diameter + Product Details Size – 4 X 12 Is CRFG2028 Width_14in + Product Details Size – 18"w X 12"h is the size for the duct opening measurement only + Product Details Size – 16"w X 34"h is the size for the duct opening measurement only