20" x 24" or 24" x 20" Cube Core Eggcrate Return Air Grille Compatible With Duct 8in Ideal for Walls & Ceilings:

Ideal for Walls & Ceilings: Designed for seamless installation in standard 10" X 8" duct openings

+ Product Details Size – 32" x 32" is the size for the duct opening measurement only

actual front end outer dimensions are approximately 27

Actual Filter Size – 33 3/4"w x 5 3/4" x 1"

Optimized Comfort: By putting airflow control at your fingertips

20" x 24" or 24" x 20" Cube Core Eggcrate Return Air Grille Compatible With Duct 8in Ideal for Walls & Ceilings:+ Product Details Size 20" x 24" or 24" x 20" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 21. 75" X 25. 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