20" x 28" or 28" x 20" Cube Core Eggcrate Return Air Grille Round Damper Ring + Product Details Size –

+ Product Details Size – 30"w X 32"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 27 5/8" width X 27 5/8" height

Experience noise-free airflow and a healthier environment thanks to our grille's innovative design

+ Product Details Size – 14"w X 30"h is the size for the duct opening measurement only

20" x 28" or 28" x 20" Cube Core Eggcrate Return Air Grille Round Damper Ring + Product Details Size –+ Product Details Size 20" x 28" or 28" x 20" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 21. 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