The Helios HRFD 250/2 is a high-efficiency axial fan designed for duct installation, featuring a cylindrical galvanised sheet steel casing with flanges on both ends, conforming to DIN 24155 standards. This ensures easy and secure mounting within ventilation systems.
The fan incorporates a directly driven, aerodynamically optimised profiled blade impeller made from durable polymers, dynamically balanced for smooth operation. It is suitable for use in environments ranging from ‑30 °C to +60 °C.
Powered by a totally enclosed 3‑phase squirrel cage motor with integrated thermal contacts, the fan is maintenance-free and offers speed control via voltage reduction. The motor includes low-noise, sealed-for-life ball bearings, ensuring quiet, reliable performance for continuous operation.