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 Actual Filter Size – 24 14" Round Duct Pipe FR M 414 White For 10 duct opening

Actual Filter Size – 24 3/4"w x 13 3/4" x 1"

+ Product Details Size – 10"w X 26"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

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

+ Product Details Size - 6"w X 28"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 Actual Filter Size – 24 14" Round Duct Pipe FR M 414 White For 10 duct opening Actual Filter Size – 24 3 4"w x 13 3 4" x 1" + Product Details Size – 10"w X 26"h is the size for the duct opening measurement only