18" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_Aluminum /* Adding space between bullet

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Airflow Control – Adjustable airflow lever allows precise control over the direction and volume of air

our Circular Air Supply Valves are ideal for low and medium pressure ventilation air conditioning systems

actual front end outer dimensions are approximately 18 5/8" width X 27 5/8" height

18" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_Aluminum /* Adding space between bullet+ Product Details Perfect Fit & Easy Sizing Designed for a 18" x 6" OR 6" X 18" duct opening (measured at the opening), with actual outer dimensions of 20. 5" W x 8. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 17. 75" x 5. 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 Made