12" x 26" or 26" x 12" Cube Core Eggcrate Return Air Grille 18" Round Duct Pipe Experience improved airflow dynamics and

Experience improved airflow dynamics and reduced noise thanks to its long neck body design

with actual outer dimensions of 8

6" x 6" - opening (vent hole - Neck Size) dimension - actual size is approx 2" wider

the actual front end outer dimensions are 6" in diameter

+ Product Details Size – 8" x 16" or 16" x 8" is the size for the duct opening measurement only

12" x 26" or 26" x 12" Cube Core Eggcrate Return Air Grille 18" Round Duct Pipe Experience improved airflow dynamics and+ Product Details Size 12" x 26" or 26" x 12" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 75" X 27. 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