8" x 28" or 28" x 8" Cube Core Eggcrate Return Air Grille 14in diameter + Product Details Size –

+ Product Details Size – 36"w X 28"h is the size for the duct opening measurement only

+ Product Details Size – 12"w X 8"h is the size for the duct opening measurement only

Adjustable airflow control - by rotating the middle disk

with actual outer dimensions of 18

+ Product Details Size - 4"w X 34"h is the size for the duct opening measurement only

8" x 28" or 28" x 8" Cube Core Eggcrate Return Air Grille 14in diameter + Product Details Size –+ Product Details Size 8" x 28" or 28" x 8" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 9. 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