8" X 28" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 10 5/8" X 30 5/8"] ceiling + Product Details Size - Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

+ Product Details Size - 10"w X 30"h is the size for the duct opening measurement only

+ Product Details Size – 25"w X 20"h is the size for the duct opening measurement only

+ Product Details Size - 18"w X 32"h is the size for the duct opening measurement only

+ Product Details Size – 12"w X 32"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 8

8" X 28" Steel Return Air Filter Grille for 1" Filter Removable Frame [Outer Dimensions: 10 5 8" X 30 5 8"] ceiling + Product Details Size Compatible With Duct 7in Applications This sheet metal DDAG A 1212 + Product Details Size 10"w X 30"h is the size for the duct opening measurement only + Product Details Size – 25"w X 20"h is the size for the duct opening measurement only