Tunnel Ventilation

Tunnel ventilation—whether for roadways, railways, or utility tunnels—requires precise, reliable, and durable solutions. CGM Expert supports engineering firms, builders, and operators through all phases of a project: from ventilation during tunnel construction and rehabilitation to the implementation of permanent tunnel ventilation systems.

Design studies for new or rehabilitation projects
→ Sizing of ventilation systems (longitudinal, transverse, or mixed).
→ Calculation of heat loads, CO, NOx, and fine particle concentrations.
→ Emergency ventilation planning (fire, power outage, etc.).
→ Evaluation of fresh air needs based on applicable standards and planned activities.

Advanced digital modeling (Ventsim™, CFD, and others)
→ Smoke dynamics simulation in case of fire.
→ Analysis of airflow behavior under different traffic scenarios, weather conditions, or incidents.

Regulatory support and compliance
→ Review of provincial and federal requirements, recommendations to meet exposure limits and safety standards.
→ Preparation of technical documents for regulatory approval (ventilation plans, risk assessments, etc.).

Commissioning and performance validation
→ On-site testing, validation of airflow rates, pressures, and air quality.
→ Adjustments based on results and real operating conditions.

Post-implementation maintenance and monitoring
→ Development of preventive maintenance plans.
→ Inspection of ventilation equipment (fans, grilles, fire dampers).
→ Training of operations personnel on safety and emergency response procedures.

Evaluation of ventilation system requirements
→ Trenches
→ Shafts
→ Stations