The S&P MD8-ES24VK Outside Air Motorized Damper Kit features a power open function and is designed specifically for 8-inch round ducts. This kit includes a ventilation control and a normally closed motorized damper, making it an ideal choice for efficient airflow management. Available in various sizes including 4, 5, 6, and 8 inches, this 24V damper is a reliable solution for your HVAC needs.