The Helios FK 200 is a flat duct measuring 1500 mm in length and 200 x 50 mm in size, made from folded Form B galvanized sheet steel. It belongs to the FK flat duct system intended for underfloor applications. This duct features a flat, rigid construction that is corrosion-resistant and non-combustible. The use of external connecting sleeves ensures smooth inner walls, which provide low flow resistance and reduce dirt accumulation, promoting efficient airflow and ease of maintenance.