20" x 36" or 36" x 20" Cube Core Eggcrate Return Air Grille Compatible with Duct 6" Available in both standard and

Available in both standard and custom sizes

+ Product Details Perfect Fit & Easy Sizing - Designed for a 6" x 28" or 28" x 6" duct opening (measured at the opening)

actual front end outer dimensions are approximately 14 5/8" width X 38 5/8" height

+ Product Details Size - 26"w X 14"h is the size for the duct opening measurement only

20" x 36" or 36" x 20" Cube Core Eggcrate Return Air Grille Compatible with Duct 6" Available in both standard and+ Product Details Size 20" x 36" or 36" x 20" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 21. 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