The Helios Fans RVB 355 is a robust connector designed to link two ventilation duct sections of 355 mm diameter. Constructed from galvanized sheet steel, it offers high resistance to corrosion and mechanical wear, making it ideal for long-term use in demanding HVAC installations. This duct coupler ensures a reliable and airtight connection, helping to maintain consistent airflow and system efficiency. Suitable for both new installations and system upgrades, the RVB 355 provides a simple yet effective solution for inline duct joining.