30" x 16" or 16" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 12in diameter actual front end outer dimensions 4 X 12 Is CRFG2028 Width_14in

actual front end outer dimensions are 25" Width X 25" Height

+ Product Details Size - 20"w X 6"h is the size for the duct opening measurement only

will change the appearance of the entire room

5" - SEE BELOW IN DESCRIPTION How To Measure A Grille

+ Product Details Size - 30"w X 18"h is the size for the duct opening measurement only

30" x 16" or 16" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 12in diameter actual front end outer dimensions 4 X 12 Is CRFG2028 Width_14in actual front end outer dimensions are 25" Width X 25" Height + Product Details Size 20"w X 6"h is the size for the duct opening measurement only