18" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 14in diameter actual front end outer dimensions 4 X 12 Is CRFG2028 Width_14in

actual front end outer dimensions are approximately 22 5/8" width X 8 5/8" height

+ Product Details Perfect Fit & Easy Sizing - Designed for a 22" x 6" OR 6" x 22" duct opening (measured at the opening)

actual front end outer dimensions are approximately 28 5/8" width X 14 5/8" height

+ Product Details Size - 25"w X 32"h is the size for the duct opening measurement only

+ Product Details Size – 36"w X 28"h is the size for the duct opening measurement only

18" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 14in diameter actual front end outer dimensions 4 X 12 Is CRFG2028 Width_14in actual front end outer dimensions are approximately 22 5 8" width X 8 5 8" height + Product Details Perfect Fit & Easy Sizing Designed for a 22" x 6" OR 6" x 22" duct opening (measured at the opening)