10" x 18" or 18" x 10" Cube Core Eggcrate Return Air Grille Return Grille + Product Details Size -

+ Product Details Size - The listed 10" diameter refers specifically to the size of the duct opening

these grilles ensure easy

actual front end outer dimensions are approximately 13

actual front end outer dimensions are approximately 12 5/8" width X 36 5/8" height

+ Product Details Size - 25"w X 36"h is the size for the duct opening measurement only

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