The Round Back Draft Damper is designed to prevent reverse airflow in HVAC systems. Featuring a galvanized steel construction for corrosion protection, it includes a Neoprene collar for enhanced durability. The spring-loaded center pin design ensures efficient operation for 4", 5", 6", and 8" sizes, while the center post design is ideal for 10" and 12" sizes. Perfect for maintaining airflow direction and optimizing system performance.