18" x 34" or 34" x 18" Cube Core Eggcrate Return Air Grille Supply Grille + Product Details Durable Construction

+ Product Details Durable Construction - Made with clear

+ Product Details Size - 20"w X 2"h is the size for the duct opening measurement only

+ Product Details Size – 24" x 30" or 30" x 24" is the size for the duct opening measurement only

+ Product Details Size – 36"w X 34"h is the size for the duct opening measurement only

+ Product Details Size – 32"w X 32"h is the size for the duct opening measurement only

18" x 34" or 34" x 18" Cube Core Eggcrate Return Air Grille Supply Grille + Product Details Durable Construction+ Product Details Size 18" x 34" or 34" x 18" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 75" X 35. 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