8" x 36" or 36" x 8" Cube Core Eggcrate Return Air Grille 18" Diameter actual front end outer dimensions

actual front end outer dimensions are approximately 34 5/8" width X 26 5/8" height

actual front end outer dimensions are approximately 32 5/8" width X 18 5/8" height

+ Product Details Size - 16"w X 16"h X 2"d (for duct opening measurement only)

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

+ Product Details Size – 14" x 22" or 22" x 14" is the size for the duct opening measurement only

8" x 36" or 36" x 8" Cube Core Eggcrate Return Air Grille 18" Diameter actual front end outer dimensions+ Product Details Size 8" x 36" or 36" x 8" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 9. 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