12" x 20" or 20" x 12" Cube Core Eggcrate Return Air Grille Brown + Product Details Size -

+ Product Details Size - 28"w X 26"h is the size for the duct opening measurement only

75"H – fits a 24" X 6" duct opening

+ Product Details Size – 36"w X 22"h is the size for the duct opening measurement only

featuring a 8" round duct opening

5/8" - 2579 PSI

12" x 20" or 20" x 12" Cube Core Eggcrate Return Air Grille Brown + Product Details Size -+ Product Details Size 12" x 20" or 20" x 12" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 75" X 21. 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