Helios Fans EVK 400

The Helios EVK 400 ventilation cover is engineered to protect supply and extract air openings in ventilation systems. It features a frame, blades, and actuators made of light grey plastic, with the actuator housing rated IP55 for reliable outdoor installation. The number of louvres varies depending on the size to accommodate different airflow requirements. This unit offers automatic control synchronized with the fan, utilizing a localised changeover switch that activates the servomotor, which in turn switches the fan circuit through a limit switch. The signal box is fully wired and includes a 1.5‑meter connection cable for easy installation. Operating on 230 V and 50/60 Hz, it supports a maximum supply air flow velocity of 6 m/​s and a maximum exhaust air flow rate of 8 m/​s.