20" x 20" Cube Core Eggcrate Return Air Grille Color_R-4.2 Yellow /* Adding space between bullet

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And Meets/Beats ASTM B280 Standard

Its removable face allows hassle-free cleaning

But they are also the most visible representation of you air system

875" width X 15

20" x 20" Cube Core Eggcrate Return Air Grille Color_R-4.2 Yellow /* Adding space between bullet+ 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