10" x 18" or 18" x 10" Cube Core Eggcrate Return Air Grille w25h25 7/8" - 3397 PSI

7/8" - 3397 PSI

actual front end outer dimensions are approximately 30 5/8" width X 8 5/8" height

actual front end outer dimensions are approximately 8

75"H – fits a 18" X 12" duct opening

10" x 18" or 18" x 10" Cube Core Eggcrate Return Air Grille w25h25 7/8" - 3397 PSI+ Product Details Size 10" x 18" or 18" x 10" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 11. 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