14" x 34" or 34" x 14" Cube Core Eggcrate Return Air Grille 18" Diameter Ideal for Walls & Ceilings:

Ideal for Walls & Ceilings: Designed for seamless installation in standard 20" X 20" duct openings

actual front end outer dimensions are approximately 28 5/8" width X 36 5/8" height

actual front end outer dimensions are approximately 32 5/8" width X 26 5/8" height -

actual front end outer dimensions are approximately 30 5/8" width X 18 5/8" height

14" x 34" or 34" x 14" Cube Core Eggcrate Return Air Grille 18" Diameter Ideal for Walls & Ceilings:+ Product Details Size 14" x 34" or 34" x 14" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 15. 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