26" x 32" or 32" x 26" Cube Core Eggcrate Return Air Grille Adjustable Return + Product Details Size – Actual Filter Size 25 AD-S-230-10x10 Width_8in

+ Product Details Size – 25"w X 30"h is the size for the duct opening measurement only

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

+ Product Details Perfect Fit & Easy Sizing - Designed for a 12" x 26" or 26" x 12" duct opening (measured at the opening)

Actual Filter Size – 13 3/4"w x 24 3/4" x 1"

actual front end outer dimensions are approximately 13

26" x 32" or 32" x 26" Cube Core Eggcrate Return Air Grille Adjustable Return + Product Details Size – Actual Filter Size 25 AD S 230 10x10 Width_8in + Product Details Size – 25"w X 30"h is the size for the duct opening measurement only + Product Details Size 26"w X 18"h is the size for the duct opening measurement only