28" x 34" or 34" x 28" Cube Core Eggcrate Return Air Grille Grille Design – These Supply Diffusers

Design – These Supply Diffusers with integral round necks are recommended for heating

Ideal for Walls & Ceilings: Designed for seamless installation in standard 20" X 10" duct openings

and lay it flat in the grid

+ Product Details Size - 22"w X 6"h is the size for the duct opening measurement only

28" x 34" or 34" x 28" Cube Core Eggcrate Return Air Grille Grille Design – These Supply Diffusers+ 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