The Helios KWL-ÜS 700 D is a symmetrical transition adapter designed to connect the KWL EC 700 D ventilation unit to round ductwork. Made from durable galvanized sheet steel, it features a 250 mm flange diameter and includes four mounting screws for secure installation. With a total installation length of 250 mm, this transition piece ensures a stable and efficient connection between the ventilation unit and round pipe systems.