20" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 2-Way actual front end outer dimensions

actual front end outer dimensions are approximately 2" wider

The smooth

12" Diameter Is The Size For The Duct Opening Measurement Only

Carefully Shrink Wrapped – With cardboard backing to prevent damage in shipment

20" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 2-Way actual front end outer dimensions+ Product Details Perfect Fit & Easy Sizing Designed for a 20" x 28" OR 28" x 20" duct opening (measured at the opening), with actual outer dimensions of 22. 5" W x 30. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 19. 75" x 27. 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