28" x 36" or 36" x 28" Cube Core Eggcrate Return Air Grille white guaranteeing efficient ventilation throughout your

guaranteeing efficient ventilation throughout your space

+ Product Details Size – 20"w X 40"h is the size for the duct opening measurement only

+ Product Details Size - 25"w X 6"h is the size for the duct opening measurement only

+ Product Details Size - 10"w X 16"h is the size for the duct opening measurement only

28" x 36" or 36" x 28" Cube Core Eggcrate Return Air Grille white guaranteeing efficient ventilation throughout your+ Product Details Size 28" x 36" or 36" x 28" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 29. 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