34" X 18" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 36 5/8" X 20 5/8"] w24h24 + Product Details Size – Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

+ Product Details Size – 25"w X 28"h is the size for the duct opening measurement only

+ Product Details Size – 20"w X 26"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 20 5/8" width X 24 5/8" height

+ Product Details Size – 25"w X 6"h is the size for the duct opening measurement only

Actual Filter Size – 23 3/4"w x 25 3/4" x 1"

34" X 18" Steel Return Air Filter Grille for 1" Filter Removable Frame [Outer Dimensions: 36 5 8" X 20 5 8"] w24h24 + Product Details Size – Compatible With Duct 7in Applications This sheet metal DDAG A 1212 + Product Details Size – 25"w X 28"h is the size for the duct opening measurement only + Product Details Size – 20"w X 26"h is the size for the duct opening measurement only