8" x 18" or 18" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 10.5" X 20.5"] return grille Heavier gauge than needed

Heavier gauge than needed

Actual Filter Size – 27 3/4"w x 17 3/4" x 1"

Its elegant look and fine finish and the natural warmth of oak wood will change the appearance of the entire room

Durable stamped steel construction ensures long-lasting performance

each diffuser is carefully shrink-wrapped with a sturdy cardboard backing

8" x 18" or 18" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 10.5" X 20.5"] return grille Heavier gauge than needed+ Product Details Perfect Fit & Easy Sizing Designed for a 8" x 18" or 18" x 8" duct opening (measured at the opening), with actual outer dimensions of 10. 5" W x 20. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 7. 75" x 17. 75" x 1" Premium Airflow Efficiency High performance cube core eggcrate design allows 95% airflow efficiency, reducing energy costs and maximizing HVAC system lifespan. Durable, Rust Free Aluminum