18" x 36" or 36" x 18" Cube Core Eggcrate Return Air Grille Color_Red Oak Design – Designed to withstand

Design – Designed to withstand bends and sharp turns without kinking

actual front end outer dimensions are approximately 14 5/8" width X 38 5/8" height

Customize effortlessly with a removable face/door

875" width X 16" height

18" x 36" or 36" x 18" Cube Core Eggcrate Return Air Grille Color_Red Oak Design – Designed to withstand+ Product Details Size 18" x 36" or 36" x 18" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 75" X 37. 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