The Helios KWL-ÜS 1800 S is a symmetrical transition piece designed to connect the KWL EC 1800 S ventilation unit to round pipe systems. It features a flange diameter of 400 mm and comes with four screws for straightforward and secure mounting. Made of galvanized sheet steel, this durable adapter ensures reliable connection and optimal airflow in ventilation duct installations. The total installation length measures 320 mm, making it a practical solution for duct transitions.