32" x 36" or 36" x 32" Cube Core Eggcrate Return Air Grille Color_Aluminum + Product Details Perfect Fit LO246 Product Details Size 32 Compatible with Duct 4"

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

+ Product Details Size - 14"w X 8"h is the size for the duct opening measurement only

Matching OBD dampers

32" x 36" or 36" x 32" Cube Core Eggcrate Return Air Grille Color_Aluminum + Product Details Perfect Fit LO246 Product Details Size 32 Compatible with Duct 4" + 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 – 25"w X 18"h is the size for the duct opening measurement only