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and durability
+ Product Details Size – 30"w X 26"h is the size for the duct opening measurement only
+ Product Details Size – 20" x 28" or 28" x 20" is the size for the duct opening measurement only
+ Product Details Size - 22"w X 12"h is the size for the duct opening measurement only
20" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Return and durability+ 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
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