6" x 10" or 6" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 8.5" X 12.5"] 3-Way or 4-Way Actual Filter Size – 19

Actual Filter Size – 19 3/4"w x 25 3/4" x 1"

and the second number represents the height

much more than the required 700 psi for r410

Actual Filter Size – 17 3/4"w x 15 3/4" x 1"

Each grille is securely shrink-wrapped with a cardboard backing to prevent damage during shipment

6" x 10" or 6" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 8.5" X 12.5"] 3-Way or 4-Way Actual Filter Size – 19+ Product Details Perfect Fit & Easy Sizing Designed for a 6" x 10" or 10" x 6" duct opening (measured at the opening), with actual outer dimensions of 8. 5" W x 12. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 5. 75" x 9. 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 Made