20" X 30" Steel Return Air Filter Grille for 1" Filter - Removable Frame - Black - [Outer Dimensions: 22 5/8" X 32 5/8"] Color_R-4.2 Yellow 9% Pure Copper meeting ASTM 190RF 10X20 FBA crafted from heavy gauge Compatible With Duct 7in

9% Pure Copper meeting ASTM B280 standards

+ Product Details Size - 22"w X 36"h is the size for the duct opening measurement only

so you are not left with much waste

actual front end outer dimensions are approximately 32 5/8" width X 22 5/8" height -

+ Product Details Size - 22"w X 28"h is the size for the duct opening measurement only

20" X 30" Steel Return Air Filter Grille for 1" Filter Removable Frame Black [Outer Dimensions: 22 5 8" X 32 5 8"] Color_R 4.2 Yellow 9% Pure Copper meeting ASTM 190RF 10X20 FBA crafted from heavy gauge Compatible With Duct 7in 9% Pure Copper meeting ASTM B280 standards + Product Details Size 22"w X 36"h is the size for the duct opening measurement only