12" x 18" or 18" x 12" Cube Core Eggcrate Return Air Grille w25h25 + Product Details Size -

+ Product Details Size - 32"w X 30"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 14" x 24" OR 24" X 14" duct opening (measured at the opening)

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

+ Product Details Size – 30"w X 10"h is the size for the duct opening measurement only

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12" x 18" or 18" x 12" Cube Core Eggcrate Return Air Grille w25h25 + Product Details Size -+ 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