20" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 2-Way 12" Diameter Is The Size

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

+ Product Details Perfect Fit & Easy Sizing - Designed for a 20" x 32" OR 32" x 20" duct opening (measured at the opening)

+ Product Description Maximize your home’s airflow with this premium Air Supply Grille air supply grille

actual front end outer dimensions are approximately 2" wider

20" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 2-Way 12" Diameter Is The Size+ 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