18" x 24" or 24" x 18" Cube Core Eggcrate Return Air Grille Color_Aluminum + Product Details Size -

+ Product Details Size - 10"w X 24"h is the size for the duct opening measurement only

+ Product Details Size – 24"w X 30"h is the size for the duct opening measurement only

Solid Base Construction – Features a solid base for stable installation and reliable protection

actual front end outer dimensions are approximately 34 5/8" width X 27 5/8" height -

please note that the total outer dimensions of the grille measure 10" in diameter

18" x 24" or 24" x 18" Cube Core Eggcrate Return Air Grille Color_Aluminum + Product Details Size -+ Product Details Size 18" x 24" or 24" x 18" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 75" X 25. 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