Tunnel and Metro Ventilation Worldwide – Fan Solutions for International Infrastructure Projects

Safe and Efficient Ventilation Systems for Tunnels and Metros

Tunnel and metro ventilation systems are an essential part of modern transport infrastructure. They ensure controlled airflow during normal operation and support targeted smoke extraction in the event of a fire. At the same time, they contribute to the safety of passengers, emergency responders, and technical equipment.

Witt & Sohn develops fan solutions for tunnel and metro projects worldwide. The systems are individually adapted to the requirements of road, rail, and metro tunnels and support safe, energy-efficient, and reliable operation.

Banana Jet® for Efficient Tunnel Ventilation

With the patented Banana Jet®, Witt & Sohn has developed an innovative solution for the longitudinal ventilation of tunnels. Compared to conventional jet fans, the Banana Jet® can generate significantly higher effective thrust – depending on the tunnel geometry.

This allows both new tunnel projects to be realized more economically and existing ventilation systems to be adapted to increasing traffic loads or higher fire protection requirements.

Experience from International Infrastructure Projects

Since the 1970s, Witt & Sohn has supplied fans for tunnel, metro, and wind tunnel projects worldwide. Decades of experience from national and international infrastructure projects continuously feed into the development of new fan solutions.

Notable reference projects include the Hamburg Elbe Tunnel. Witt & Sohn also supports planners, plant engineers, and operators worldwide in implementing demanding tunnel and metro projects.

Testing and Quality Assurance

All fans are tested on our own test benches under realistic conditions. Jet fans are tested according to ISO 13350, axial and centrifugal fans according to ISO 5801. These standardized tests enable a reliable assessment of performance data.

Worldwide Project Support

From Pinneberg near Hamburg, Witt & Sohn supports customers worldwide in the planning, design, and implementation of modern tunnel and metro ventilation systems. The combination of technical expertise, individual project planning, and years of experience enables solutions for the widest range of infrastructure projects.

Frequently Asked Questions about Tunnel and Metro Ventilation

Which fans are used for tunnel and metro systems?

We supply jet fans such as the Banana Jet® as well as axial fans for longitudinal and transverse ventilation of road, rail, and metro tunnels.

What is the Banana Jet®?

The Banana Jet® is a jet fan developed by Witt & Sohn with curved airflow guidance for particularly efficient and space-saving tunnel ventilation.

Why are smoke extraction systems important in tunnels?

In the event of a fire, smoke extraction systems help to controllably remove smoke and heat. The fan design is determined according to project-specific fire and temperature requirements.

Which standards apply to tunnel ventilation?

Depending on the project and country, different national and international standards apply, including those for fire protection and smoke extraction, which we take into account when designing our fans.

Does Witt & Sohn support international tunnel projects?

Yes, we support tunnel and metro projects worldwide – from technical design and consulting to on-site commissioning.

Weiterführende Informationen

Learn more about our industry solutions, discover our reference projects in tunnel and metro construction, or find out about our Banana Jet®.