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

+ Product Details Size – 36"w X 16"h is the size for the duct opening measurement only

75" width X 5

+ Product Details Size – 14"w X 12"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 38 5/8" width X 18 5/8" height -

6"w X 6"h 3-Way Fixed Curved Blade Air Supply Diffuser - Vent Duct Cover - Grille Register - Sidewall or Cieling - High Airflow - White

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