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 margin-right: 12px Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

margin-right: 12px

+ Product Details Size - The listed 6" diameter refers specifically to the size of the duct opening

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

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

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 margin right: 12px Compatible With Duct 7in Applications This sheet metal DDAG A 1212 margin right: 12px + Product Details Size The listed 6" diameter refers specifically to the size of the duct opening