Helios Fans VDW EC 250

The Helios VDW EC 250 is a vertical discharge EC roof fan designed for high efficiency and durable operation. It features a seawater-resistant aluminium casing with an integrated protection guard to withstand outdoor conditions. The motor support and base plate are constructed from galvanised steel and include an inlet cone for optimal airflow. Threaded bolts on the base plate allow for simple attachment of intake air accessories following the DIN 24155 (page 3) hole pattern. A bird guard on the outlet complies with DIN EN ISO 13857 safety standards.

This fan uses a high-efficiency backward curved centrifugal impeller made from galvanised sheet steel, dynamically balanced to DIN ISO 1940 – 1 to ensure smooth, stable performance.

Powered by a highly efficient, speed-controllable EC external rotor motor, the fan offers maintenance-free, interference-resistant operation with ball bearing mounting. Integrated electronic temperature monitoring safeguards both the motor and electronics. An internal potentiometer allows precise speed adjustment between minimum and maximum settings. The fan supports continuously variable speed control via an external potentiometer or the Helios EUR-EC universal control system. Electrical connections are protected by a weatherproof IP65 terminal box mounted externally on the casing.