24" x 28" or 28" x 24" Cube Core Eggcrate Return Air Grille 8" Round Duct Pipe + Product Description Maximize the

+ Product Description Maximize the efficiency of your ventilation system with our top-of-the-line HVAC grilles and registers

with actual outer dimensions of 12

if your hole is 20" wide by 14" tall

actual front end outer dimensions are approximately 24 5/8" width X 18 5/8" height

Actual Filter Size – 11 3/4"w x 5 3/4" x 1"

24" x 28" or 28" x 24" Cube Core Eggcrate Return Air Grille 8" Round Duct Pipe + Product Description Maximize the+ Product Details Size 24" x 28" or 28" x 24" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 25. 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