10" X 8" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 12 5/8" X 10 5/8"] 18" Diameter this grill will provide the Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

this grill will provide the design aesthetic you're looking for

actual front end outer dimensions are approximately 24 5/8" width X 16 5/8" height

actual front end outer dimensions are approximately 26 5/8" width X 18 5/8" height

+ Product Details Size – 20"w X 36"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 32 5/8" width X 36 5/8" height

10" X 8" Steel Return Air Filter Grille for 1" Filter Removable Frame [Outer Dimensions: 12 5 8" X 10 5 8"] 18" Diameter this grill will provide the Compatible With Duct 7in Applications This sheet metal DDAG A 1212 this grill will provide the design aesthetic you're looking for actual front end outer dimensions are approximately 24 5 8" width X 16 5 8" height