28" x 34" or 34" x 28" Cube Core Eggcrate Return Air Grille 18" Round Duct Pipe actual front end outer dimensions

actual front end outer dimensions are approximately 38 5/8" width X 34 5/8" height

with actual outer dimensions of 14

+ Product Details Size - 34"w X 22"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 10" x 20" duct opening (measured at the opening)

28" x 34" or 34" x 28" Cube Core Eggcrate Return Air Grille 18" Round Duct Pipe actual front end outer dimensions+ Product Details Size 28" x 34" or 34" x 28" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 29. 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