Helios Fans RR 250 C

The Helios RR 250 C centrifugal duct fan is designed for direct installation in circular duct systems, providing reliable airflow for medium to small volumes where high resistance is present. Its robust casing is made from galvanized sheet steel and includes spigots to fit standard duct dimensions. The backward-curved impeller, constructed from durable polymers, is directly mounted on the motor and dynamically balanced for optimal efficiency and low noise operation. Powered by a single-phase external rotor motor, the unit is fully enclosed, maintenance-free, and equipped with built-in thermal contacts and sealed-for-life ball bearings. Speed control is easily achieved through voltage reduction, making this fan a practical and cost-effective solution for ducted ventilation applications.