The Ruck ISOR 400 E4 K 01 is a fully insulated 400mm single box fan designed for quiet and efficient ventilation. It features a backward curved centrifugal impeller housed in galvanized sheet steel for durability and stable performance. The connection spigots are equipped with double lip seals to ensure secure and leak-resistant airflow. The swing-out fan unit provides easy access for maintenance. Powered by a robust single-phase AC motor with voltage control, the fan also includes an integrated thermal switch for safe operation. Suitable for outdoor installation, this model offers reliable and long-lasting performance across a wide range of applications.