Smoke through fans 

Smoke through  fans play an important part in the global development of economies, contributing to the creation of large infrastructures and the improvement of urban communications. Most tunnel ventilation covers road tunnels, metro tunnels and railway tunnels. The safety and air quality requirements are the most important aspects in the demand for tunnel ventilation, both for new constructions and in the improvement and adaptation of old infrastructures. Although the main objective of tunnel ventilation is safety and smoke control in case of fire, the control of emissions of combustion gases from vehicles also plays an important part.