10" x 36" or 36" x 10" Cube Core Eggcrate Return Air Grille w30h30 [Outer Dimensions: 20

[Outer Dimensions: 20

75"H – fits a 18" X 4" duct opening

during winter

+ Product Details Perfect Fit & Easy Sizing - Designed for a 28" x 32" OR 32" x 28" duct opening (measured at the opening)

10" x 36" or 36" x 10" Cube Core Eggcrate Return Air Grille w30h30 [Outer Dimensions: 20+ Product Details Size 10" x 36" or 36" x 10" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 11. 75" X 37. 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