32" x 34" or 34" x 32" Cube Core Eggcrate Return Air Grille 18in diameter actual front end outer dimensions

actual front end outer dimensions are approximately 28 5/8" width X 24 5/8" height

+ Product Details Perfect Fit & Easy Sizing - Designed for a 14" x 30" OR 30" X 14" duct opening (measured at the opening)

1/2" White insulation will give you a good R value of 3

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

+ Product Details Size - 22"w X 10"h is the size for the duct opening measurement only

32" x 34" or 34" x 32" Cube Core Eggcrate Return Air Grille 18in diameter actual front end outer dimensions+ Product Details Size 32" x 34" or 34" x 32" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 33. 75" X 35. 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