Air supply/exhaust system with vertical shaft

Air supply,exhaust/Exhaust system with vertical shaft

This system exhausts polluted air inside a tunnel through a shaft and/or a duct and supplies external fresh air into the tunnel by using fans installed in a ventilation section or a ventilation tower.
The shaft type ventilation system is a system applicable for any length of tunnel by replacing polluted air with external fresh air through a shaft which is constructed at the place where hazardous substances in air inside the tunnel reach the permissible limit.
The exhaust system emits polluted air in a tunnel from a ventilation tower through a shaft, resulting in substantial reduction of hazardous substances at the wayout of tunnel.
The fan in this system can change the ventilation flow rate by variable pitch control mechanism.

Variable pitch axial fan

Air supply exhaust system with vertical shaft

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