12" X 30" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 14 5/8" X 32 5/8"] Material_Steel strong aluminum construction with smooth 4 X 12 Is CRFG2028 Width_14in

strong aluminum construction with smooth finished edges for easy and safe use

+ Product Details Size - 28"w X 14"h is the size for the duct opening measurement only

+ Product Spec Sheet Floor Register Spec Sheet

+ Product Details Size - 30"w X 36"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 20 5/8" width X 18 5/8" height

12" X 30" Steel Return Air Filter Grille for 1" Filter Removable Frame [Outer Dimensions: 14 5 8" X 32 5 8"] Material_Steel strong aluminum construction with smooth 4 X 12 Is CRFG2028 Width_14in strong aluminum construction with smooth finished edges for easy and safe use + Product Details Size 28"w X 14"h is the size for the duct opening measurement only