18" x 22" or 22" x 18" Cube Core Eggcrate Return Air Grille flat stamped steel + Product Details Size -

+ Product Details Size - 30"w X 18"h is the size for the duct opening measurement only

+ Product Details Size - 26"w X 20"h is the size for the duct opening measurement only

+ Product Details Size - 6" X 6" is the size for the duct opening measurement only

Tamper-Proof Locking Mechanism – Includes an eight-tumbler lock with a supplied key to prevent unauthorized access

Tough reinforced metallized polyester jacket - tear and puncture resistant

18" x 22" or 22" x 18" Cube Core Eggcrate Return Air Grille flat stamped steel + Product Details Size -+ Product Details Size 18" x 22" or 22" x 18" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 75" X 23. 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