12" x 16" or 16" x 12" Cube Core Eggcrate Return Air Grille 14in diameter + Product Details Size –

+ Product Details Size – 24"w X 6"h is the size for the duct opening measurement only

+ Product Details Size - 22"w X 36"h is the size for the duct opening measurement only

+ Product Details Size - 12"w X 24"h X 2"d (for duct opening measurement only)

16" Diameter Is The Size For The Duct Opening Measurement Only

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

12" x 16" or 16" x 12" Cube Core Eggcrate Return Air Grille 14in diameter + Product Details Size –+ Product Details Size 12" x 16" or 16" x 12" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 75" X 17. 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