12" x 30" or 30" x 12" Cube Core Eggcrate Return Air Grille Powder-Coated 75" width X 25

75" width X 25

4" X 10" Is The Size For The Duct Opening (floor/vent hole) Measurement Only

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R value rating of insulation - R3

12" x 30" or 30" x 12" Cube Core Eggcrate Return Air Grille Powder-Coated 75" width X 25+ Product Details Size 12" x 30" or 30" x 12" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 75" X 31. 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