14" x 18" or 18" x 14" Cube Core Eggcrate Return Air Grille Material_Aluminum + Product Details Size -

+ Product Details Size - 36"w X 34"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 34 5/8" width X 32 5/8" height

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

adds an extra layer of protection

+ Product Details Size – 36"w X 10"h is the size for the duct opening measurement only

14" x 18" or 18" x 14" Cube Core Eggcrate Return Air Grille Material_Aluminum + Product Details Size -+ 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