26" x 26" Cube Core Eggcrate Return Air Grille Powder-Coated 3 * insulation density is

3 * insulation density is 30kgs/cbm = 0

actual front end outer dimensions are approximately 22 5/8" width X 16 5/8" height

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+ Product Details Outer dimensions: 21

26" x 26" Cube Core Eggcrate Return Air Grille Powder-Coated 3 * insulation density is+ Product Details Size 26" x 26" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 27. 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 electric