The Helios KWL-ÜS 1200 S is a symmetrical transition adapter designed to connect the KWL EC 1200 S ventilation unit to round duct systems. Constructed from galvanized sheet steel, it features a flange diameter of 355 mm and comes with four screws for secure attachment. With a total installation length of 300 mm, this transition piece ensures a reliable and efficient connection between the ventilation unit and round pipework