18" x 30" or 30" x 18" Cube Core Eggcrate Return Air Grille Return Grille [Outer Dimensions: 20

[Outer Dimensions: 20

+ Product Details Size – 25"w X 26"h is the size for the duct opening measurement only

+ Product Details Size – 16"w X 25"h is the size for the duct opening measurement only

+ Product Details Size – 14" X 4" is the size for the duct opening (floor/vent hole) measurement only

actual front end outer dimensions are approximately 27 5/8" width X 34 5/8" height -

18" x 30" or 30" x 18" Cube Core Eggcrate Return Air Grille Return Grille [Outer Dimensions: 20+ 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