18" x 30" or 30" x 18" Cube Core Eggcrate Return Air Grille 6" Diameter minimizing waste

minimizing waste

Actual Filter Size – 47 3/4"w x 23 3/4" x 1"

With a 5" diameter for the duct opening measurement

Made from high-quality aluminum

18" x 30" or 30" x 18" Cube Core Eggcrate Return Air Grille 6" Diameter minimizing waste+ Product Details Size 18" x 30" or 30" x 18" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 75" X 31. 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