Helios Fans SB EC 250

The Helios SB EC 250 is a high-efficiency EC centrifugal fan housed in a robust, sound-absorbing casing made from galvanized sheet steel. Designed with round connectors to fit standard ductwork, the interior features a perforated sheet metal lining and a 50 mm thick mineral fibre board for enhanced acoustic insulation. A swing-out cover provides easy access, while the motor and impeller unit can be retracted for convenient maintenance.

The fan uses a backward curved centrifugal impeller engineered for optimal performance and quiet operation. It is dynamically balanced to ensure vibration-free, smooth airflow.

Power is provided by a speed-controlled EC external rotor motor with IP44 protection. This energy-efficient motor is ball bearing mounted, maintenance-free, and free from radio interference. It includes integrated electronic temperature monitoring to safeguard both motor and control electronics. An internal potentiometer allows fan speed to be set anywhere between the minimum and maximum levels. Additional stepless speed control is available via an external potentiometer or through the EUR-EC universal control system. Electrical connection is made through a standard IP54-rated terminal box mounted on an extended cable.