The Helios VKH 200÷180−300 is a duct airflow regulator made from robust polymer material with an integrated rubber sealing ring for reliable airtight installation. Designed for insertion into ducts and duct components, it can be installed vertically or horizontally. The device ensures consistent airflow by adjusting the opening cross-section, maintaining a constant air volume despite changes in system conditions. Ideal for precise airflow control in various ventilation applications.