18" x 36" or 36" x 18" Cube Core Eggcrate Return Air Grille Compatible with Duct 6" 75"H – fits a 16"

75"H – fits a 16" X 4" duct opening

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+ Product Details Size – 10"w X 30"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 8

+ Product Details Size – 16"w X 10"h is the size for the duct opening measurement only

18" x 36" or 36" x 18" Cube Core Eggcrate Return Air Grille Compatible with Duct 6" 75"H – fits a 16"+ Product Details Size 18" x 36" or 36" x 18" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 75" X 37. 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