The Helios FK 150 is a flat duct measuring 1500 mm in length and 150 x 50 mm in cross-section, constructed from galvanized sheet steel with folded Form B. It is part of the FK flat duct system designed for underfloor installations. This duct features a rigid, flat design that is corrosion-resistant and non-combustible. Connections are made using external sleeves, creating smooth inner walls that reduce flow resistance and minimize dirt buildup, ensuring efficient airflow and easy maintenance.