8" x 28" or 28" x 8" Cube Core Eggcrate Return Air Grille w8h8 + Product Details Size –

+ Product Details Size – 12" x 30" or 30" x 12" is the size for the duct opening measurement only

actual front end outer dimensions are approximately 22 5/8" width X 38 5/8" height

Actual Filter Size – 25 3/4"w x 21 3/4" x 1"

powder-coated steel

actual front end outer dimensions are approximately 27 5/8" width X 28 5/8" height

8" x 28" or 28" x 8" Cube Core Eggcrate Return Air Grille w8h8 + Product Details Size –+ Product Details Size 8" x 28" or 28" x 8" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 9. 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