Helios Fans EVK 355

The Helios EVK 355 is designed to cover supply and extract air openings, ensuring effective ventilation protection. Its frame, blades, and actuators are constructed from light grey plastic, with the actuator housing rated IP55 to withstand outdoor conditions. The number of louvres varies based on the size of the unit to meet ventilation demands. The cover features automatic control in sync with the fan, using a localised changeover switch that activates the servomotor, which in turn switches the fan circuit via a limit switch. The unit comes with a fully wired signal box and a 1.5‑meter connection cable for convenient installation. It operates at 230 V, 50/60 Hz, supporting a maximum supply air flow velocity of 6 m/​s and a maximum exhaust air flow rate of 8 m/​s.