34" X 28" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 36 5/8" X 30 5/8"] 18" Diameter + Product Details Size – Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

+ Product Details Size – 14"w X 18"h is the size for the duct opening measurement only

Both lines taped together every 18in for easier handling & installation

Actual Filter Size – 33 3/4"w x 19 3/4" x 1"

+ Product Details Size – 29"w X 22"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 20 5/8" width X 34 5/8" height

34" X 28" Steel Return Air Filter Grille for 1" Filter Removable Frame [Outer Dimensions: 36 5 8" X 30 5 8"] 18" Diameter + Product Details Size – Compatible With Duct 7in Applications This sheet metal DDAG A 1212 + Product Details Size – 14"w X 18"h is the size for the duct opening measurement only Both lines taped together every 18in for easier handling & installation