34" X 10" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 36 5/8" X 12 5/8"] 12" Round Duct Pipe + Product Details Size – Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

+ Product Details Size – 25"w X 16"h is the size for the duct opening measurement only

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

actual front end outer dimensions are approximately 12 5/8" width X 22 5/8" height

+ Product Details Size - 36"w X 4"h is the size for the duct opening measurement only

+ Product Details Size - 18"w X 8"h is the size for the duct opening measurement only

34" X 10" Steel Return Air Filter Grille for 1" Filter Removable Frame [Outer Dimensions: 36 5 8" X 12 5 8"] 12" Round Duct Pipe + Product Details Size – Compatible With Duct 7in Applications This sheet metal DDAG A 1212 + Product Details Size – 25"w X 16"h is the size for the duct opening measurement only + Product Details Size 20"w X 20"h is the size for the duct opening measurement only