14" X 28" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 16 5/8" X 30 5/8"] Adjustable Return + Product Details Size - Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

+ Product Details Size - 36"w X 6"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 7

+ Product Details Size - 4"w X 30"h is the size for the duct opening measurement only

[Outer Dimensions: 16

+ Product Details Size - 10"w X 18"h is the size for the duct opening measurement only

14" X 28" Steel Return Air Filter Grille for 1" Filter Removable Frame [Outer Dimensions: 16 5 8" X 30 5 8"] Adjustable Return + Product Details Size Compatible With Duct 7in Applications This sheet metal DDAG A 1212 + Product Details Size 36"w X 6"h is the size for the duct opening measurement only actual front end outer dimensions are approximately 7