22" x 28" or 28" x 22" Cube Core Eggcrate Return Air Grille Aluminum - Cube Core + Product Details Size –

+ Product Details Size – 18" x 20" or 20" x 18" is the size for the duct opening measurement only

actual front end outer dimensions are approximately 27 5/8" width X 34 5/8" height

actual front end outer dimensions are approximately 12 5/8" width X 34 5/8" height

actual front end outer dimensions are approximately 20 5/8" width X 36 5/8" height

+ Product Details Size – 24"w X 24"h

22" x 28" or 28" x 22" Cube Core Eggcrate Return Air Grille Aluminum - Cube Core + Product Details Size –+ Product Details Size 22" x 28" or 28" x 22" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 23. 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