34" x 34" Cube Core Eggcrate Return Air Grille with filter Ideal for Walls & Ceilings:

Ideal for Walls & Ceilings: Designed for seamless installation in standard 16" X 6" duct openings

+ Product Details Size - 4"w X 36"h is the size for the duct opening measurement only

+ Product Spec Sheet Return Air Grille Spec Sheet

14"w X 4"h Is The Size For The Duct Opening Measurement Only

34" x 34" Cube Core Eggcrate Return Air Grille with filter Ideal for Walls & Ceilings:+ Product Details Size 34" x 34" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 35. 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 electric