The Helios FK‑Ü 125/200 adapter allows a smooth transition from a DN 125 mm round pipe to a flat duct measuring 200 x 50 mm. It belongs to the underfloor duct system made from galvanized steel sheet, specially developed for domestic ventilation needs. This component offers an efficient and corrosion-resistant solution for concealed air duct systems, ensuring optimal airflow distribution in new building constructions.