32" x 36" or 36" x 32" Cube Core Eggcrate Return Air Grille Color_Aluminum + Product Details Perfect Fit 4 X 12 Is CRFG2028 Width_14in

+ Product Details Perfect Fit & Easy Sizing - Designed for a 10" x 34" or 34" x 10" duct opening (measured at the opening)

+ Product Details Size – 26"w X 18"h is the size for the duct opening measurement only

this model allows for mounting without removing the thermostat

85" width X 21

+ Product Details Size – 25"w X 18"h is the size for the duct opening measurement only

32" x 36" or 36" x 32" Cube Core Eggcrate Return Air Grille Color_Aluminum + Product Details Perfect Fit 4 X 12 Is CRFG2028 Width_14in + Product Details Perfect Fit & Easy Sizing Designed for a 10" x 34" or 34" x 10" duct opening (measured at the opening) + Product Details Size – 26"w X 18"h is the size for the duct opening measurement only