Road Longitudinal Tunnels
Road Longitudinal Tunnels are characterised by: » 3rd Party Certified products » Reliability » 100%reversibility » Corrosion Resistance » Energy efficiency » Easy maintenance
In normal operating conditions the Tunnel Ventilation System has to keep the air quality and the concentration of pollutants within safety levels. In emergency conditions, the Ventilation system is designed to control or extract smoke to allow fast and safe evacuation and fire fighting activities. This means that the fans have to be High Temperature certified by a 3rd Party.
Longitudinal ventilation systems generally use jet fans installed on the tunnel ceiling/walls.
The main advantage of this type of Ventilation System is that the costs both for installing and for maintaining are relatively low.
In order to control the smoke, the fans have to be reversible in bi-directional tunnels and can be either uni-directional or truly reversible in uni-directional tunnels.
Jet Fans have to be resistant to corrosion due to the salt used in winter time in mountains areas, or for tunnels located by the coast including undersea tunnels.
If the is no space available in the Tunnel for Jet Fans, another system can be used: Saccardo Ventilation where instead of Jet Fans, the system uses banks of large axial fans in parallel fitted with special nozzles to accelerate the air inside the tunnel.
- M25 Bell Common Tunnel, UK
- M25 Holmesdale Tunnel, UK
- Certification to EN12101-3 and ISO 21927-3: F200, F300, F400
- 100% reversible fans
- Hot dip galvanized casing, optional paint
- Jetfans with silencers 1D, 1.5D, 2D
- Jetfans with stainless steel construction as an option
- Jetfans within restricted height Tunnels