8-inch Starting Collar with Damper, engineered to initiate airflow control with precision and efficiency. Designed specifically for ductboard applications, our starting collar features a built-in damper that allows for precise airflow regulation, ensuring optimal comfort and energy efficiency. Its user-friendly design simplifies installation, facilitating seamless integration into your ductboard system without the need for additional tools or hardware. Experience the difference that quality craftsmanship and advanced technology can make in your HVAC system.