18" x 34" or 34" x 18" Cube Core Eggcrate Return Air Grille Supply Grille 75" Deep - Will Fit

75" Deep - Will Fit All Garrage Doors - Insulated And Non Insulated Garrage Doors [The Hole In The Door SHould Be: 15 ¼ x 9 ¾]

only measure the "hole" in the wall/duct

By simply measuring the width or the length of the vent

+ Product Details Size – 36"w X 34"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 75" Deep - Will Fit+ 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