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 - 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size - 14"w X 4"h is the size for the duct opening measurement only

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

+ Product Details Size - 14"w X 24"h is the size for the duct opening measurement only

and extends HVAC system life

actual front end outer dimensions are approximately 7

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 4 X 12 Is CRFG2028 Width_14in + Product Details Size 14"w X 4"h is the size for the duct opening measurement only + Product Details Size 10"w X 18"h is the size for the duct opening measurement only