The Helios FR 500 is a robust flange designed to connect circular flanged fans to round ducting systems. Made from durable galvanized steel, it aligns precisely with the fan’s hole pattern and diameter, ensuring a secure fit. The flange’s spigot is suitable for both flexible connectors and standard circular ducting. Ideal for various ventilation setups, the FR 500 is one of ten sizes available in the Helios flange range, covering diameters from 180 mm to 710 mm.