8" x 8" Cube Core Eggcrate Return Air Grille Copper Coil-Insulated Line Set + Product Details Size –

+ Product Details Size – 24" x 24" is the size for the duct opening measurement only

+ Product Details Size – 10" x 30" or 30" x 10" is the size for the duct opening measurement only

+ Product Details Size – 8" x 16" or 16" x 8" is the size for the duct opening measurement only

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8" x 8" Cube Core Eggcrate Return Air Grille Copper Coil-Insulated Line Set + Product Details Size –+ Product Details Size 8" x 8" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 9. 75" X 9. 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 bills