Since the 1970s WITT & SOHN has supplied fans for national and international tunnels, metro and wind tunnel projects.

This includes not only very large axial fans for ventilation control centers and wind tunnels, but also jet fans for thrust generation. Having experience over many decades in this area WITT & SOHN was one of the first fan manufacturers in the world which could offer heat resistant fans up to 700 ° C. The complete product range of WITT & SOHN is certified for temperature classes F400, F300 and F200 according to EN12101-3. The development of the Banana Jet ® at the end of the 1990s has led to a small revolution in the longitudinal ventilation, as huge cost savings can be achieved by the use of these jet fans.

It is particularly noteworthy that all fans "full size" are measured at our test facility: All jet fans (30-3000N) are measured on test benches according to ISO 13350, axial and centrifugal fans (up to 1.000.000m ³ / h and 20.000Pa) according to ISO 5801. The test benches were designed partly together with the University of Karlsruhe and are of course AMCA certified.

Some individual industriesTunnelbau

  • Road Tunnel (longitudinal ventilation / exhaust centers)
  • Metro (longitudinal ventilation / exhaust centers)
  • Railway tunnel (longitudinal ventilation / exhaust centers)
  • Wind Tunnel (main and auxiliary fan)

References: 800 total tunnel

Reference -Video - Banana Jet®, WestConnex, Sydney

Reference-Video - Axial fans, Metro station Oullins

Reference-Video - Jet fans, Velsertunnel (road tunnel), Netherlands

Reference-Video - Metro Line 4, Rio de Janeiro, Brazil

Reference-Video - Tunnel Saint Beat, France

Reference-Video - Metro Oullins, France


Reference List Axial EN12101-3

Reference List Axial Metro stations

Reference List Axial road tunnel

Reference List Axial heavy duty with 4-pin blade attachment

Reference List axial fans with anti-stall device

Reference list Banana Jet ®

Reference list of jet fans

Reference list jet fans EN 12101-3

Some projects in tunnelingTunnelbau

  • Renovation Elbtunnel Tubes 1-3
  • Tunnel Chain S10 in Austria
  • Renovation RATP Paris
  • Mexico City- Line 12
  • Nörra Länken in Stockholm
  • Delhi Metro Line 3
  • Brisbane Airport Link/Northern Busway
  • Banana Jet® fan from the movie "Mission Impossible - Rogue Nation", Ascot Racecourse/England

      Mission-Impossible       Pfeil    (please click to zoom in)


ADAC tests

Individual products in tunnel

Jet fans

  • Mounting Frame
  • Silencer
  • Anchor Bolts
  • Assembly
  • Softstart/Frequency Converters
  • Sensors/probes of all kinds

Banana Jet®

Axial fan

  • Fan frame
  • Splitter-type Silencer
  • Silencer
  • Diffusor
  • Measuring Cabinet
  • Butterfly Damper
  • Fire Damper
  • Auxiliary Fan
  • Backdraft Damper
  • Partition Wall
  • Assembly
  • Frequency Converter
  • Sensors/probes of all kinds