12" x 18" or 18" x 12" Cube Core Eggcrate Return Air Grille ceiling and sound level range of

and sound level range of NC 25 to 35

+ Product Details Size – 6" x 22" or 22" x 6" is the size for the duct opening measurement only

actual front end outer dimensions are approximately 26 5/8" width X 38 5/8" height -

75" Width X 17

12" x 18" or 18" x 12" Cube Core Eggcrate Return Air Grille ceiling and sound level range of+ Product Details Size 12" x 18" or 18" x 12" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 75" X 19. 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