Longitudinal Tunnel Ventilation System is designed to provide effective air circulation and ventilation inside tunnels by moving air along the length of the tunnel. Jet Fans, which are typically axial-flow fans, are installed at selected locations along the tunnel ceiling to generate airflow and maintain the required air movement. These fans help remove vehicle exhaust gases, reduce the accumulation of pollutants, and maintain acceptable air quality under normal operating conditions. During fire emergencies, appropriately designed tunnel ventilation systems help control smoke movement and support evacuation and firefighting operations. Jet fans are selected according to tunnel length, cross-sectional area, air volume requirements, pressure losses, and applicable safety standards. They are widely used in road tunnels, highway tunnels, and underground transportation infrastructure where reliable ventilation and smoke management are essential.
