18" x 36" or 36" x 18" Cube Core Eggcrate Return Air Grille w22h22 featuring a 6" round duct

featuring a 6" round duct opening

Traditional HVAC systems were designed for cold air

this guard ensures long-lasting protection and security

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

75"H – fits a 16" X 12" duct opening

18" x 36" or 36" x 18" Cube Core Eggcrate Return Air Grille w22h22 featuring a 6" round duct+ Product Details Size 18" x 36" or 36" x 18" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 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