6" x 30" or 30" x 6" Cube Core Eggcrate Return Air Grille w25h25 + Product Details Size -

+ Product Details Size - 12"w X 18"h is the size for the duct opening measurement only

Carefully shrink wrapped with cardboard backing to prevent damage in shipment

+ Product Details Size - 20"w X 25"h is the size for the duct opening measurement only

The 1/2" white insulation

6" x 30" or 30" x 6" Cube Core Eggcrate Return Air Grille w25h25 + Product Details Size -+ Product Details Size 6" x 30" or 30" x 6" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 7. 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