20" x 28" or 28" x 20" Cube Core Eggcrate Return Air Grille Return Grille it integrates effortlessly into T-bar

it integrates effortlessly into T-bar or plaster frame ceilings

Click Add to Cart now & enjoy a high qulaity copper line for your project

Ideal for Walls & Ceilings: Designed for seamless installation in standard 18" X 8" duct openings

Rigid Built For External Use – The sturdy and rigid design features noise-free components that eliminate vibration and excess noise to the louvers

20" x 28" or 28" x 20" Cube Core Eggcrate Return Air Grille Return Grille it integrates effortlessly into T-bar+ Product Details Size 20" x 28" or 28" x 20" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 21. 75" X 29. 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