12" x 26" or 26" x 12" Cube Core Eggcrate Return Air Grille w36h36 Actual Filter Size – 33

Actual Filter Size – 33 3/4"w x 31 3/4" x 1"

Perfect for both residential and commercial use

75" width X 11

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12" x 26" or 26" x 12" Cube Core Eggcrate Return Air Grille w36h36 Actual Filter Size – 33+ Product Details Size 12" x 26" or 26" x 12" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 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