24" X 10" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 26 5/8" X 12 5/8"] w18h18 + Product Details Size - 4 X 12 Is CRFG2028 Width_14in

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

and the second number represents the height

+ Product Details Size - 30"w X 6"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 10 5/8" width X 20 5/8" height

High quality – high quality solid stamped steel with counter-sunk screw holes (screws included) and no sharp edges

24" X 10" Steel Return Air Filter Grille for 1" Filter Fixed Hinged [Outer Dimensions: 26 5 8" X 12 5 8"] w18h18 + Product Details Size 4 X 12 Is CRFG2028 Width_14in + Product Details Size 6"w X 6"h is the size for the duct opening measurement only and the second number represents the height