16" X 25" Steel Return Air Filter Grille for 1" Filter - Removable Frame - Black - [Outer Dimensions: 18 5/8" X 27 5/8"] 18" Round Duct Pipe + Product Details Size - Suitable for all AC 8in diameter 12125SDCLNGBX

+ Product Details Size - 12"w X 16"h is the size for the duct opening measurement only

+ Product Details Size - 26"w X 24"h is the size for the duct opening measurement only

margin-right: 12px

actual front end outer dimensions are approximately 20 5/8" width X 26 5/8" height

16" X 25" Steel Return Air Filter Grille for 1" Filter Removable Frame Black [Outer Dimensions: 18 5 8" X 27 5 8"] 18" Round Duct Pipe + Product Details Size Suitable for all AC 8in diameter 12125SDCLNGBX + Product Details Size 12"w X 16"h is the size for the duct opening measurement only + Product Details Size 26"w X 24"h is the size for the duct opening measurement only