16" x 28" or 28" x 16" Cube Core Eggcrate Return Air Grille Return Grille + Product Details Size -

+ Product Details Size - 24"w X 32"h is the size for the duct opening measurement only

+ Product Details Size - 14"w X 8"h is the size for the duct opening measurement only

75"H – fits a 18" X 12" duct opening

+ Product Details Size - 16"w X 30"h is the size for the duct opening measurement only

+ Product Details Size – 24" x 24" with 10" collar T-Bar drop ceiling perforated return grill - metal back casing

16" x 28" or 28" x 16" Cube Core Eggcrate Return Air Grille Return Grille + Product Details Size -+ Product Details Size 16" x 28" or 28" x 16" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 17. 75" X 29. 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