The Helios FR 450 is a galvanized steel flange designed to connect circular flanged fans directly to round ducting. Engineered for compatibility, it aligns with the standard hole pattern and diameter of Helios fans. The integrated spigot accommodates both flexible and rigid duct connections. Suitable for a wide range of ventilation installations, the FR 450 is part of a comprehensive series of flanges ranging from 180 mm to 710 mm.