20" x 36" or 36" x 20" Cube Core Eggcrate Return Air Grille Black no exceptions

no exceptions

+ Product Details Size - 18"w X 16"h is the size for the duct opening measurement only

with actual outer dimensions of 16

+ Product Details Size – 20" x 24" or 24" x 20" is the size for the duct opening measurement only

Optional Butterfly Damper Available At Asin: B007CNEL1W

20" x 36" or 36" x 20" Cube Core Eggcrate Return Air Grille Black no exceptions+ Product Details Size 20" x 36" or 36" x 20" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 21. 75" X 37. 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