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Top Grill Dimensions: 7-1/3" x 7-1/3". Fits Duct Opening Dimensions: 6” x 6". METAL CONSTRUCTION: A premium steel floor vent register designed with a one-piece wraparound collar for increased strength provides the rigidity needed to ensure a well-built ventilation that would last a lifetime. UNRESTRICTED AIRFLOW CONTROL: Patented design with opposed blade damper to ensure unrestricted and versatile airflow with lever for easy control over this floor register. SMOOTH EDGE DESIGN: Smooth paint finish ensures top quality product and be able to run your fingers across its surface and not worry cutting yourself. EASY AND VERSATILE INSTALLATION: Our floor registers are designed for easy and versatile installation to any HVAC application you will ever need! Made In China.