18" x 34" or 34" x 18" Cube Core Eggcrate Return Air Grille 6" Diameter thanks to counter-sunk screw holes

thanks to counter-sunk screw holes and included screws

and installation is quick and simple with the included screws

Actual Filter Size – 19 3/4"w x 11 3/4" x 1"

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18" x 34" or 34" x 18" Cube Core Eggcrate Return Air Grille 6" Diameter thanks to counter-sunk screw holes+ 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