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Protan Ventiflex Shaft has been developed for the vertical supply of fresh air through a shaft construction.
Some tunnels start as an opening on the surface, but many service tunnels begin at the bottom of a vertical shaft. In such tunnels it is crucial for the ventilation system to ensure the supply of fresh air down to the tunnel and to provide practical, airtight and durable transitions from a vertical to a horizontal ventilation duct system.
How it works