30" x 30" Cube Core Eggcrate Return Air Grille steel 75"H – fits a 18"

75"H – fits a 18" X 6" duct opening

Ideal for Walls & Ceilings: Designed for seamless installation in standard 16" X 16" duct openings

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+ Product Details Size – 10" x 12" or 12" x 10" is the size for the duct opening measurement only

actual front end outer dimensions are approximately 27 5/8" width X 24 5/8" height

30" x 30" Cube Core Eggcrate Return Air Grille steel 75"H – fits a 18"+ Product Details Size 30" x 30" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 31. 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 electric