24" x 34" or 34" x 24" Cube Core Eggcrate Return Air Grille 2-Way Actual Filter Size – 21

Actual Filter Size – 21 3/4"w x 17 3/4" x 1"

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+ Product Details Size – 25"w X 36"h is the size for the duct opening measurement only

diagonally feed it through the square hole

+ Product Details Size - 8"w X 28"h is the size for the duct opening measurement only

24" x 34" or 34" x 24" Cube Core Eggcrate Return Air Grille 2-Way Actual Filter Size – 21+ Product Details Size 24" x 34" or 34" x 24" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 25. 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