20" x 34" or 34" x 20" Cube Core Eggcrate Return Air Grille with filter and then smoothly drop in

and then smoothly drop in the grill

you have 16 different varieties to choose from

Ideal for Walls & Ceilings: Designed for seamless installation in standard 8" X 6" duct openings

+ Product Details Size - 32"w X 12"h is the size for the duct opening measurement only

20" x 34" or 34" x 20" Cube Core Eggcrate Return Air Grille with filter and then smoothly drop in+ Product Details Size 20" x 34" or 34" x 20" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 21. 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