Helios Fans EVK 450

The Helios EVK 450 ventilation cover is designed to protect supply and extract air openings within ventilation systems. It features a frame, blades, and actuators made from light grey plastic, with an actuator housing rated IP55, ensuring durability for outdoor installation. The number of louvres varies according to the size to optimize airflow. This cover includes automatic control linked to the fan, using a localised changeover switch that activates the servomotor, which then switches the fan circuit via a limit switch. The signal box comes fully wired and includes a 1.5‑meter connection cable for straightforward installation. It operates on 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.