24" x 30" or 30" x 24" Cube Core Eggcrate Return Air Grille 8" Round Duct Pipe Actual Filter Size – 33

Actual Filter Size – 33 3/4"w x 13 3/4" x 1"

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

+ Product Details Size - 20"w X 12"h is the size for the duct opening measurement only

Actual Filter Size – 24 3/4"w x 25 3/4" x 1"

+ Product Details Size - 32"w X 36"h is the size for the duct opening measurement only

24" x 30" or 30" x 24" Cube Core Eggcrate Return Air Grille 8" Round Duct Pipe Actual Filter Size – 33+ Product Details Size 24" x 30" or 30" x 24" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 25. 75" X 31. 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