30" x 36" or 36" x 30" Cube Core Eggcrate Return Air Grille Color_Aluminum providing maximum flexibility

providing maximum flexibility

Actual Filter Size – 29 3/4"w x 11 3/4" x 1"

+ Product Spec Sheet Lay-In 3 Coned Spec Sheet

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30" x 36" or 36" x 30" Cube Core Eggcrate Return Air Grille Color_Aluminum providing maximum flexibility+ Product Details Size 30" x 36" or 36" x 30" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 32. 5" X 38. 5". 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