6" x 30" or 30" x 6" Cube Core Eggcrate Return Air Grille Material_Aluminum improves airflow

improves airflow

Design – Cubic core eggcrate design Offers highest airflow efficiency at almost 95%

the second number represents the height

actual front end outer dimensions are approximately 21

6" x 30" or 30" x 6" Cube Core Eggcrate Return Air Grille Material_Aluminum improves airflow+ 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