tunnel ventilation fan

Tunnel Ventilation

Smoke Management and Control

Given the modern fleet of vehicles on European roads, nowadays road tunnel ventilation systems much more often have to serve the purpose of securing smoke free escape routes in the case of a tunnel fire rather than the purpose of providing the required air quality.

Aerodynamics, thermodynamics and ventilation of underground traffic structures are the core capabilities of our company. As experts in air flow control, our staff has decades of first-hand experience, especially applied to the requirements of smoke management in underground transportation facilities.


Our specialists are familiar to the relevant codes, standards, laws and guidelines. Such as the German guidelines VDI, the guidelines about equipment of road tunnels RABT and ZTV-ING, the Swiss guidelines SIA and ASTRA for ventilation, the safety manual BSA of the Swiss Federal Roads Office FEDRO (ASTRA), the Austrian road tunnel safety law, the Austrian guidelines RVS, the ASFiNAG road tunnel ventilation design handbook PLaPB, the European Directive on minimum safety requirements for tunnels in the Trans-European Road Network 2004/54/EC, the NFPA and PIARC publications on safety, smoke control and air demand in road tunnels and many other applicable national and international requirements.

Designing the Tunnel Ventilation System

Before a tunnel goes into the construction phase, its intended safety measures design undergoes calculation, simulation and evaluation in every detail. Deep insight into the fundamentals of fluid dynamics and thermodynamics is required, the nature of smoke propagation and fire development and the interaction with the tunnel ventilation systems has to be understood. The human behavior, also in panic, has to be taken into consideration. Last but not least all relevant design criteria from tunnel ventilation safety codes, guidelines and standards as well as third party requirements have to be considered to create a safe, stable, reliable and state-of-the-art system.

We reliably deliver tunnel ventilation system design from concept to detailed design to tendering to commissioning and testing.

Calculations and Simulations

Where required, we do all the calculations, modeling and dynamic simulation of the aerodynamics and thermodynamics of complex ventilation and smoke extraction systems, including the effects of traffic, ambient weather and tunnel fire.

Procurement Support and Site Supervision

We offer professional support in procurement and commissioning of tunnel ventilation systems, conduct factory acceptance tests FAT, site acceptance tests SAT and fire / smoke tests as your agent, prepare technical specifications and bill of quantities (BoQ) for jet-fans, supply- and exhaust-fans, fire-dampers, air-quality instruments, flow state monitors and other ventilation components, elaborate system specification for control systems and assistance in their implementation.


We assist in tendering of engineering-, installation- and design-services, components and equipment and, last but not least, deliver independent third-party expert opinion, ventilation design review and specialist counseling - worldwide.

UID: CHE-145.886.163, Managing partners: Ludwig Ilg and Petr Pospisil

tunnel ventilation engineering services