20" x 36" or 36" x 20" Cube Core Eggcrate Return Air Grille ceiling installation is a breeze

installation is a breeze

+ Product Details Size – 14" x 30" or 30" x 14" is the size for the duct opening measurement only

during winter

+ Product Details Size - 25"w X 14"h is the size for the duct opening measurement only

Ideal for Walls & Ceilings: Designed for seamless installation in standard 16" X 12" duct openings

20" x 36" or 36" x 20" Cube Core Eggcrate Return Air Grille ceiling installation is a breeze+ Product Details Size 20" x 36" or 36" x 20" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 21. 75" X 37. 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