For covering supply and exhaust air openings. Frame, slats and actuators made of light gray plastic, actuator housing in IP 55 for outdoor installation. Automatic control with fan: Local changeover switch switches the actuator, which switches the fan circuit via a limit switch. Actuator fully wired, equipped with 1.5 m connection cable. 230 V, 50/60 Hz. Max. flow rate of supply air 6 m/s. Max. flow rate of exhaust air 8 m/s.