18" x 24" or 24" x 18" Cube Core Eggcrate Return Air Grille Color_Aluminum please note that the total

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

Vertical blades in the back

+ Product Description Introducing the 6" Butterfly Damper – Your Solution for Controlled Airflow

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

18" x 24" or 24" x 18" Cube Core Eggcrate Return Air Grille Color_Aluminum please note that the total+ 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