16" x 24" or 24" x 16" Cube Core Eggcrate Return Air Grille Copper Coil-Insulated Line Set + Product Details Size -

+ Product Details Size - 34"w X 20"h is the size for the duct opening measurement only

+ Product Details Outer dimensions: 31

+ Product Details Size – 16" x 18" or 18" x 16" is the size for the duct opening measurement only

+ Product Details Size – 20" x 22" or 22" x 20" is the size for the duct opening measurement only

16" x 24" or 24" x 16" Cube Core Eggcrate Return Air Grille Copper Coil-Insulated Line Set + Product Details Size -+ Product Details Size 16" x 24" or 24" x 16" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 17. 75" X 25. 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