18" x 30" or 30" x 18" Cube Core Eggcrate Return Air Grille return grille + Product Details Size –

+ Product Details Size – 8" x 28" or 28" x 8" is the size for the duct opening measurement only

it's built to last and will never rust

Actual Filter Size – 27 3/4"w x 23 3/4" x 1"

very easy to do

75"H – fits a 10" X 10" duct opening

18" x 30" or 30" x 18" Cube Core Eggcrate Return Air Grille return grille + Product Details Size –+ 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