Tunnel and Underground Space Ventilation
ProjectsInfrastructure ventilation solution

Tunnel and Underground Space Ventilation

Underground projects combine day-to-day air-quality control with emergency smoke-management requirements. Jet thrust, fan spacing, reversibility, acoustic limits and fire-duty performance must be evaluated as one system.

Tunnel and Underground Space Ventilation reference image
Process flow

How this ventilation duty is arranged

01Define operating modes
02Model airflow path
03Calculate thrust or duty
04Select reversible operation
05Confirm fire condition

Jet thrust is not the same as airflow

Jet fans are commonly selected by thrust, aerodynamic efficiency and installation losses. Tunnel geometry, traffic direction, obstructions and portal conditions affect the number and arrangement of units.

Confirm emergency duty

Where fans operate during a fire, confirm temperature-time rating, cabling, controls, mounting and certification against the project specification. Computational analysis may be required for complex spaces.

Expected outputs

Longitudinal air movementPollutant dilutionEmergency smoke management
Matched equipment

Products used in this solution.

These equipment pages already exist on the site, so buyers can move from a complete ventilation duty to individual fan and accessory specifications.

Custom project

Send airflow, pressure, medium and installation conditions for fan selection.

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