18" x 34" or 34" x 18" Cube Core Eggcrate Return Air Grille Supply Grille 875" width X 21

875" width X 21

+ Product Details Durable Construction - Made with clear

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

Featuring a multi-shutter damper with an easy-access lever

only measure the "hole" in the wall/duct

18" x 34" or 34" x 18" Cube Core Eggcrate Return Air Grille Supply Grille 875" width X 21+ 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