The Ruck ISOR 400 EC K 01 is a fully insulated 400mm single box fan engineered for quiet, efficient, and dependable airflow. It features a backward curved centrifugal impeller within a galvanized sheet steel housing and connection spigots with double lip seals for secure and airtight duct integration. The swing-out fan unit allows for easy maintenance access. An external rotor EC motor provides stepless control for precise and energy-efficient operation, while internal electronic temperature monitoring enhances safety and reliability. Designed for outdoor installation, this fan delivers high-performance ventilation across commercial, industrial, and specialist applications.