10" x 36" or 36" x 10" Cube Core Eggcrate Return Air Grille w30h30 75"H – fits a 18"

75"H – fits a 18" X 4" duct opening

+ Product Details Size - 14"w X 34"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 10 5/8" width X 38 5/8" height

during winter

+ Product Details Size - 26"w X 22"h is the size for the duct opening measurement only

10" x 36" or 36" x 10" Cube Core Eggcrate Return Air Grille w30h30 75"H – fits a 18"+ Product Details Size 10" x 36" or 36" x 10" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 11. 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