18" x 34" or 34" x 18" Cube Core Eggcrate Return Air Grille Adjustable Return 6" width X 11

6" width X 11

Pre-flared ends with nuts are for simple and easy installation

+ Product Details Size - 4"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 38 5/8" height

18" x 34" or 34" x 18" Cube Core Eggcrate Return Air Grille Adjustable Return 6" width X 11+ Product Details Size 18" x 34" or 34" x 18" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 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