8" x 28" or 28" x 8" Cube Core Eggcrate Return Air Grille w8h8 Actual Filter Size – 11

Actual Filter Size – 11 3/4"w x 9 3/4" x 1"

+ Product Details Size - 8"w X 6"h is the size for the duct opening measurement only

+ Product Details Size – 10"w X 10"h is the size for the duct opening measurement only

+ Product Details Size – 26"w X 18"h is the size for the duct opening measurement only

Rust-Free Aluminum - Made from strong

8" x 28" or 28" x 8" Cube Core Eggcrate Return Air Grille w8h8 Actual Filter Size – 11+ 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