20" x 24" Cube Core Eggcrate Return Air Filter Grille for 1" Filter steel but you will appreciate the

but you will appreciate the benefits over the period of time

With a 8" diameter for the duct opening measurement

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20" x 24" Cube Core Eggcrate Return Air Filter Grille for 1" Filter steel but you will appreciate the+ 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