14" x 18" or 18" x 14" Cube Core Eggcrate Return Air Grille Material_Aluminum adds an extra layer of

adds an extra layer of protection

Actual Filter Size – 11 3/4"w x 11 3/4" x 1"

Powder-coat finish

+ Product Details Size - 10"w X 20"h X 2"d (for duct opening measurement only)

and durability

14" x 18" or 18" x 14" Cube Core Eggcrate Return Air Grille Material_Aluminum adds an extra layer of+ Product Details Size 14" x 18" or 18" x 14" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 15. 75" X 19. 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