18" x 24" or 24" x 18" Cube Core Eggcrate Return Air Grille Compatible With Duct 6in Achieve the perfect airflow with

Achieve the perfect airflow with adjustable control by rotating the middle disk

actual front end outer dimensions are approximately 14 5/8" width X 32 5/8" height

+ Product Details Size - 20"w X 8"h is the size for the duct opening measurement only

Actual Filter Size – 7 3/4"w x 29 3/4" x 1"

18" x 24" or 24" x 18" Cube Core Eggcrate Return Air Grille Compatible With Duct 6in Achieve the perfect airflow with+ 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