The Helios BLS 100/100 provides supply and extract ventilation for enclosed spaces requiring protection from fire and smoke propagation. It effectively prevents heat build-up through continuous air exchange, ensuring safety in fire situations. Certified for fire resistance from F30 to F120 per DIN 4102, this ventilation solution is maintenance-free and does not require inspections, as it contains no moving components. Its construction is moisture-resistant and highly durable against oils, petrol, and weak acids. Easy to install, the BLS 100/100 is suitable for use based on individual project-related type approvals (vBG).