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

actual front end outer dimensions are approximately 28 5/8" width X 36 5/8" height

+ Product Details Size - 4"w X 34"h is the size for the duct opening measurement only

+ Product Details Size – 12"w X 4"h is the size for the duct opening measurement only

These are specially sized to fit into all drop ceilings

powder-coated finish adds a touch of elegance while also being scratch-resistant

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