10" x 34" or 34" x 10" Cube Core Eggcrate Return Air Grille 14" Diameter + Product Details Size -

+ Product Details Size - 36"w X 26"h is the size for the duct opening measurement only

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+ Product Details Size - 10"w X 14"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 21

10" x 34" or 34" x 10" Cube Core Eggcrate Return Air Grille 14" Diameter + Product Details Size -+ Product Details Size 10" x 34" or 34" x 10" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 11. 75" X 35. 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