26" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Aluminum - Cube Core } /* Added styles for

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Adjustable airflow control - by rotating the middle disk

Adjust the airflow to your preference by simply opening or closing the top panel

+ Product Details Size – 30"w X 10"h is the size for the duct opening measurement only

26" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Aluminum - Cube Core } /* Added styles for+ Product Details Perfect Fit & Easy Sizing Designed for a 26" x 28" OR 28" x 26" duct opening (measured at the opening), with actual outer dimensions of 28. 5" W x 30. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 25. 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