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KROS 400 is a high-quality mechanical air flow control and shut-off valve for round ducts. KROS 400 round regulating damper are particularly useful for controlling airflow, adjusting ventilation systems, and closing air ducts during maintenance work. Constructed from corrosion-resistant galvanized steel, suitable for 400mm round ducts. Easy to install and adjust, allowing precise control of airflow volume.

KROS 500 is a high-quality round regulating damper with rubber gasket for efficient airflow control. Constructed from corrosion-resistant galvanized steel, suitable for 500 mm round ducts. Easy to install, suitable for high-volume airflow in commercial, industrial, and specialized HVAC systems.