20" x 24" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Black + Product Details Size -

+ Product Details Size - 26"w X 30"h is the size for the duct opening measurement only

875" width X 15

Perfect for sidewall or ceiling installation

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+ Product Details Size – 14" x 30" or 30" x 14" is the size for the duct opening measurement only

20" x 24" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Black + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 20" x 24" OR 24" x 20" duct opening (measured at the opening), with actual outer dimensions of 22. 5" W x 26. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 19. 75" x 23. 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