The Helios FR 355 is a precision-engineered flange designed for connecting circular flanged fans to round ductwork. Made from durable galvanized steel, it aligns perfectly with standard fan diameters and hole configurations, allowing easy installation using flexible connectors or direct duct connections. As part of a versatile range spanning 180 mm to 710 mm, the FR 355 provides a secure and efficient solution for integrating fans into ventilation systems.