30" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Floor Grille resisting rust and wear while

resisting rust and wear while adding a sleek

and smooth surface for years to come

For 6" Round Duct Opening - Spiral or Flex

Insulation – A thick blanket of fiberglass insulation provides you with an R-Value of 4

30" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Floor Grille resisting rust and wear while+ Product Details Perfect Fit & Easy Sizing Designed for a 30" x 8" OR 8" x 30" duct opening (measured at the opening), with actual outer dimensions of 32. 5" W x 10. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 29. 75" x 7. 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