10" x 26" or 26" x 10" Cube Core Eggcrate Return Air Grille w20h20 + Product Details Size –

+ Product Details Size – 18"w X 8"h is the size for the duct opening measurement only

Installation is hassle-free

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+ Product Details Heavy-Duty Steel Construction - Made from 20-gauge steel for superior durability and reliable performance

Actual Filter Size – 29 3/4"w x 31 3/4" x 1"

10" x 26" or 26" x 10" Cube Core Eggcrate Return Air Grille w20h20 + Product Details Size –+ Product Details Size 10" x 26" or 26" x 10" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 11. 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