28" x 28" Cube Core Eggcrate Return Air Grille return grille + Product Details Size -

+ Product Details Size - 20"w X 2"h is the size for the duct opening measurement only

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Actual Filter Size – 35 3/4"w x 25 3/4" x 1"

pair it with our butterfly dampers

+ Product Details Size - 10"w X 8"h is the size for the duct opening measurement only

28" x 28" Cube Core Eggcrate Return Air Grille return grille + Product Details Size -+ Product Details Size 28" x 28" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 29. 75" X 29. 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 electric