18" x 20" or 20" x 18" Cube Core Eggcrate Return Air Grille Color_Red Oak Wood Our innovative adjustable design changes

Our innovative adjustable design changes the game

+ Product Details Perfect Fit & Easy Sizing - Designed for a 26" x 32" OR 32" x 26" duct opening (measured at the opening)

Actual Filter Size – 15 3/4"w x 33 3/4" x 1"

Actual Filter Size – 29 3/4"w x 33 3/4" x 1"

+ Product Details Size - 16"w X 12"h is the size for the duct opening measurement only

18" x 20" or 20" x 18" Cube Core Eggcrate Return Air Grille Color_Red Oak Wood Our innovative adjustable design changes+ Product Details Size 18" x 20" or 20" x 18" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 75" X 21. 75". High Quality High quality, rust free aluminum construction with smooth finished edges and counter sunk screw holes (screws included); no sharp edges.. Installation Location sidewall and ceiling. Design Cubic core eggcrate design Offers highest airflow efficiency at almost 95%, reducing