16" x 26" or 26" x 16" Cube Core Eggcrate Return Air Grille Material_Steel + Product Details Size -

+ Product Details Size - 18"w X 24"h X 2"d (for duct opening measurement only)

+ Product Details Size - 30"w X 30"h X 2"d (for duct opening measurement only)

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+ Product Details Size - 34"w X 24"h is the size for the duct opening measurement only

+ Product Details Size - 20"w X 36"h is the size for the duct opening measurement only

16" x 26" or 26" x 16" Cube Core Eggcrate Return Air Grille Material_Steel + Product Details Size -+ Product Details Size 16" x 26" or 26" x 16" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 17. 75" X 27. 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