10" x 26" or 26" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 12.5" X 28.5"] w36h36 actual front end outer dimensions 4 X 12 Is CRFG2028 Width_14in

actual front end outer dimensions are approximately 12 5/8" width X 34 5/8" height

+ Product Details Size – 10" round duct opening-

+ Product Details Size - 30"w X 22"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 30" x 24" OR 24" x 30" duct opening (measured at the opening)

Actual Filter Size – 33 3/4"w x 13 3/4" x 1"

10" x 26" or 26" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Aluminum White [Outer Dimensions: 12.5" X 28.5"] w36h36 actual front end outer dimensions 4 X 12 Is CRFG2028 Width_14in actual front end outer dimensions are approximately 12 5 8" width X 34 5 8" height + Product Details Size – 10" round duct opening