The Helios BLS 150/150 is engineered for supply and extract ventilation in enclosed spaces requiring fire and smoke protection. It prevents heat buildup by maintaining constant air exchange, meeting fire resistance ratings from F30 to F120 as per DIN 4102 standards. Featuring a maintenance-free and inspection-free design with no moving parts, this unit ensures long-lasting performance. It is moisture-resistant and resistant to oils, petrol, and weak acids, making it highly durable. Installation is simple, and the unit is approved for use based on project-specific type approval (vBG).