The Helios BLS 150 is designed for supply and extract ventilation in enclosed spaces requiring protection against fire and smoke spread. It effectively prevents heat buildup through constant air exchange, ensuring safety during fire incidents. This unit meets fire resistance classifications from F30 to F120 under DIN 4102 standards. With no moving parts, it is maintenance-free and inspection-free, making it reliable and durable. The device is resistant to moisture and largely impervious to oils, petrol, and weak acids. Installation is straightforward, and its use is permitted based on individual project-related type approval (vBG).