18" x 26" or 26" x 18" Cube Core Eggcrate Return Air Grille 10" Round Duct Pipe + Product Details Size -

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

+ Product Details Size - 34"w X 14"h is the size for the duct opening measurement only

+ Product Description Improve your HVAC system with our high-quality

+ Product Details Size - 12"w X 8"h is the size for the duct opening measurement only

18" x 26" or 26" x 18" Cube Core Eggcrate Return Air Grille 10" Round Duct Pipe + Product Details Size -+ Product Details Size 18" x 26" or 26" x 18" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 75" X 27. 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