20" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Black actual front end outer dimensions 4 X 12 Is CRFG2028 Width_14in

actual front end outer dimensions are 31

+ Product Details Perfect Fit & Easy Sizing - Designed for a 8" x 26" or 26" x 8" duct opening (measured at the opening)

+ Product Details Perfect Fit & Easy Sizing - Designed for a 8" x 12" or 12" x 8" duct opening (measured at the opening)

+ Product Details Perfect Fit & Easy Sizing - Designed for a 10" x 8" or 8" x 10" duct opening (measured at the opening)

75"H – fits a 16" X 10" duct opening

20" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Black actual front end outer dimensions 4 X 12 Is CRFG2028 Width_14in actual front end outer dimensions are 31 + Product Details Perfect Fit & Easy Sizing Designed for a 8" x 26" or 26" x 8" duct opening (measured at the opening)