20" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter d /* Slightly darker color for

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+ Product Details Size - 28"w X 34"h is the size for the duct opening measurement only

But they are also the most visible representation of you air system

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+ Product Details Size - 14"w X 20"h is the size for the duct opening measurement only

20" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter d /* Slightly darker color for+ Product Details Perfect Fit & Easy Sizing Designed for a 20" x 14" OR 14" x 20" duct opening (measured at the opening), with actual outer dimensions of 22. 5" W x 16. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 19. 75" x 13. 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