Helios Fans SB EC 355

The Helios SB EC 355 is a high-efficiency EC centrifugal fan designed for low-noise operation in ventilation systems. Its casing is constructed from galvanized sheet steel with round connectors compatible with standard ducting. The interior features a perforated metal lining and is filled with a 50 mm thick mineral fibre board for superior sound insulation. A swing-out cover offers convenient access, while the motor and impeller unit is retractable for easy servicing.

At the core of the unit is a backward curved centrifugal impeller, dynamically balanced to deliver quiet and efficient airflow.

The fan is powered by an energy-saving, speed-regulated EC external rotor motor with IP44 protection. The motor is maintenance-free, equipped with ball bearings, and operates interference-free. It includes integrated electronic temperature monitoring for both the motor and electronics. An internal potentiometer allows setting the fan speed anywhere between its minimum and maximum range, with additional stepless speed control available via an external potentiometer or the EUR-EC universal control system. Electrical connection is via a standard IP54 terminal box mounted on an extended cable.