28" x 36" or 36" x 28" Cube Core Eggcrate Return Air Grille ceiling 75"H – fits a 12"

75"H – fits a 12" X 6" duct opening

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+ Product Details Size – 12"w X 20"h is the size for the duct opening measurement only

Actual Filter Size – 11 3/4"w x 25 3/4" x 1"

ensuring a clean and smooth appearance in any environment

28" x 36" or 36" x 28" Cube Core Eggcrate Return Air Grille ceiling 75"H – fits a 12"+ 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