18" X 12" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 20 5/8" X 14 5/8"] Copper Coil-Insulated Line Set + Product Details Size – Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

+ Product Details Size – 10" X 2" is the size for the duct opening (floor/vent hole) measurement only

All of these grills have dampers

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+ Product Details Size – 8"w X 26"h is the size for the duct opening measurement only

+ Product Details Size – 20"w X 14"h is the size for the duct opening measurement only

18" X 12" Steel Return Air Filter Grille for 1" Filter Removable Frame [Outer Dimensions: 20 5 8" X 14 5 8"] Copper Coil Insulated Line Set + Product Details Size – Compatible With Duct 7in Applications This sheet metal DDAG A 1212 + Product Details Size – 10" X 2" is the size for the duct opening (floor vent hole) measurement only All of these grills have dampers