
Hazard
Uncontrolled ventilation: Tunnels
Knowledge and understanding
Hazard | Learning outcome |
---|---|
Uncontrolled ventilation: Tunnels | Understand all associated hazard knowledge |
Hazard Knowledge
There are relatively few tunnels in the UK that are long enough to require a mechanical ventilation system. Ventilation is used to supply fresh air, remove fumes, gases and dust, regulate the temperature, and to assist with smoke control in the event of a fire.
Tunnels may quickly fill with poor quality air due to the ventilation system:
- Driving fumes or smoke to unaffected areas
- Assisting the development and spread of fire
- Being impacted due to the incident or operational activities
- Being isolated
- Having failed or not being commissioned
Maintaining effective ventilation will be a key consideration for the incident commander. For further information involving fires refer to Fires in buildings: Fires in tunnels
- Control measureUnderstand and control ventilation systems in tunnels