20" x 36" or 36" x 20" Cube Core Eggcrate Return Air Grille Insulated Line Set Actual Filter Size – 33

Actual Filter Size – 33 3/4"w x 17 3/4" x 1"

Ideal for Walls & Ceilings: Designed for seamless installation in standard 16" X 10" duct openings

+ Product Details Durable Construction - Made with clear

provides a modern look and quiet operation due to its half-inch by half-inch cube design

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20" x 36" or 36" x 20" Cube Core Eggcrate Return Air Grille Insulated Line Set Actual Filter Size – 33+ 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