30" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w20h20 + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 10" x 24" or 24" x 10" duct opening (measured at the opening)

R value rating of insulation - R3

Traditional HVAC systems were designed for cold air

+ Product Details Perfect Fit & Easy Sizing - Designed for a 16" x 6" OR 6" X 16" duct opening (measured at the opening)

30" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w20h20 + Product Details Perfect Fit+ 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