6" x 8" or 8" x 6" Cube Core Eggcrate Return Air Grille Material_Steel + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 20" x 24" OR 24" x 20" duct opening (measured at the opening)

+ Product Details Size – 24" x 30" or 30" x 24" is the size for the duct opening measurement only

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+ Product Details Size – 20"w X 28"h is the size for the duct opening measurement only

6" x 8" or 8" x 6" Cube Core Eggcrate Return Air Grille Material_Steel + Product Details Perfect Fit+ Product Details Size 6" x 8" or 8" x 6" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 7. 75" width X 9. 75" height. 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%,