6" x 18" or 18" x 6" Cube Core Eggcrate Return Air Grille Powder Coated Weather and Pest Proof –

Weather and Pest Proof – These louvers are especially designed to prevent water from entering your home

+ Product Details Perfect Fit & Easy Sizing - Designed for a 24" x 24" duct opening (measured at the opening)

+ Product Details Size - 20"w X 30"h is the size for the duct opening measurement only

+ Product Details Size – 30"w X 34"h is the size for the duct opening measurement only

+ Product Details Size – 8"w X 24"h is the size for the duct opening measurement only

6" x 18" or 18" x 6" Cube Core Eggcrate Return Air Grille Powder Coated Weather and Pest Proof –+ Product Details Size 6" x 18" or 18" x 6" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 7. 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