The Helios BLS 200/150 is engineered for effective supply and extract ventilation in enclosed spaces requiring protection against fire and smoke spread. It supports continuous air exchange to help reduce heat buildup and meets fire resistance ratings from F30 to F120 in compliance with DIN 4102. The unit is designed for hassle-free operation with no moving parts, making it completely maintenance-free and inspection-free. Constructed for durability, it is resistant to moisture, oils, petrol, and weak acids. Installation is simple, and the product is approved for use in specific projects based on type approval (vBG), making it a reliable solution for fire-safe ventilation needs.