This round damper blade is engineered to regulate air volume within duct systems, suitable for use as a positive shutoff or for automatic control in low‑leakage and modulating HVAC applications. Designed for ductwork with low to medium airflow velocity and static pressure, it installs directly inside the duct for precise adjustment of supply or return air.Manufactured from acier galvanisé, the blade is available in sizes ranging from 4″ à 20″ (including 4″, 5″, 6″, 7″, 8″, 9″, 10″, 12″, 14″, 16″, 18″, and 20″), with material thickness options from 20GA à 28GA. Configuration choices include spring‑loaded or stamped bearings, stud, wing nut, washer, and handle for smooth operation and reliable positioning.Produced through precision stamping, this round damper blade is ideal for commercial, industrial, and residential round ductwork systems requiring dependable airflow regulation. Custom sizes and OEM configurations are available upon request.