20" x 20" Cube Core Eggcrate Return Air Grille w8h8 + Product Details Size -

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

Insulation – A thick blanket of fiberglass insulation provides you with an R-Value of 8

you can watch this informative video tutorial: How to Measure Your Vent Hole Before Ordering a Grille

Its removable face allows hassle-free cleaning

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20" x 20" Cube Core Eggcrate Return Air Grille w8h8 + Product Details Size -+ Product Details Size 20" x 20" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 21. 75" X 21. 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