12" X 12" Steel Return Air Filter Grille for 1" Filter - Removable Frame - Black - [Outer Dimensions: 14 5/8" X 14 5/8"] RV Mobile Home + Product Details Size – Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

+ Product Details Size – 10"w X 26"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 12 5/8" width X 32 5/8" height -

+ Product Details Size - 20"w X 4"h is the size for the duct opening measurement only

If you are looking to enhance your project with a top-of-the-line unit

+ Product Details Size - 20"w X 30"h is the size for the duct opening measurement only

12" X 12" Steel Return Air Filter Grille for 1" Filter Removable Frame Black [Outer Dimensions: 14 5 8" X 14 5 8"] RV Mobile Home + Product Details Size – Compatible With Duct 7in Applications This sheet metal DDAG A 1212 + Product Details Size – 10"w X 26"h is the size for the duct opening measurement only actual front end outer dimensions are approximately 12 5 8" width X 32 5 8" height