20" x 20" Cube Core Eggcrate Return Air Grille Material_Aluminum Design – Designed to withstand

Design – Designed to withstand bends and sharp turns without kinking

Its removable face allows hassle-free cleaning

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You may think of grilles and registers as a generic component of the ventilation system in your house

No Sharp Surface Edges

20" x 20" Cube Core Eggcrate Return Air Grille Material_Aluminum Design – Designed to withstand+ 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