Road Tunnels

Ventilation systems for road tunnels are often inverter controlled and use Carbon Monoxide and Nitrogen Oxide detectors to ensure the that the tunnel is well ventilated in all traffic conditions.

We can provide system design services and tailored products for:

  • Transverse tunnel ventilation
  • Semi-Transverse tunnel ventilation
  • Longitudinal ventilation


In the event of a fire this same system needs to be able to act as the smoke extract system allowing the tunnel occupants to evacuate and emergency services to reach the source of the fire and tackle it.

Fast Facts

  • Large axial flow fans are used for transverse and semi transverse systems where the air is supplied or extracted through ducts from plant rooms.
  • Frequently the fans are VFD controlled to provide additional steps in ventilation.
  • Often the fans are 100% reversible so that supply fans can also extract.
  • To clear smoke from one side of a fire, reversible fans may be used with the duct system to create a longitudinal flow along the tunnel.
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