12" x 18" or 18" x 12" Cube Core Eggcrate Return Air Grille w25h25 listed size +2" diameter

listed size +2" diameter

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actual front end outer dimensions are approximately 27 5/8" width X 28 5/8" height

Refrigerant - 1/2" White Insulation - 50' Long

12" x 18" or 18" x 12" Cube Core Eggcrate Return Air Grille w25h25 listed size +2" diameter+ Product Details Size 12" x 18" or 18" x 12" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 75" X 19. 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