Helios Fans HRFD 355÷4÷2

The Helios HRFD 355÷4÷2 is a high-performance axial fan designed for demanding industrial ventilation systems, offering flexibility with its dual-speed operation through Dahlander winding technology.

Its cylindrical duct housing is made from durable galvanised sheet steel and features flanges at both ends for easy integration into ductwork. Flange dimensions and fixing hole patterns comply with DIN 24155 standards, and a terminal box is mounted on the casing exterior for convenient electrical connection.

The fan incorporates a highly efficient impeller with aerodynamically optimised profiled blades, constructed from impact-resistant polymers. The impeller is dynamically balanced to ensure smooth, vibration-free performance and reliable airflow across a temperature range from ‑30°C to +60°C.

Equipped with a totally enclosed, 3‑phase squirrel cage motor, the HRFD 355÷4÷2 supports 2‑speed operation using pole switching via Dahlander windings. The motor is maintenance-free and features sealed-for-life ball bearings for quiet, dependable operation. This model is ideal for applications requiring variable airflow with minimal maintenance.