14" x 36" or 36" x 14" Cube Core Eggcrate Return Air Grille w6h6 Equipped with a locking eight-tumbler

Equipped with a locking eight-tumbler key system

The first number in a grille size

+ Product Details Size - 30"w X 2"h is the size for the duct opening measurement only

+ Product Details Size - 34"w X 8"h is the size for the duct opening measurement only

14" x 36" or 36" x 14" Cube Core Eggcrate Return Air Grille w6h6 Equipped with a locking eight-tumbler+ Product Details Size 14" x 36" or 36" x 14" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 15. 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