★ Tunnel - steel cable connection support and PP reinforced panels.
★ Automatic doors - steel support with support elements laid in FRP.
★ Automatic control of the isolation doors inside the tunnel.
★ The operation of the acid mist tower fan creates a negative pressure inside the tunnel, the acid mist produced by the acid washing is confined inside the tunnel and it will be impossible for the acid mist to escape from the tunnel.
★ The production workshop is free of acid mist, protecting the equipment and the building structure.
★ Top with anti-corrosion lighting;
★ Negative pressure control.
★ Top of tunnel with longitudinal sealing strip (PP flexible sheet);
★ The tunnel is separated into several process zones by means of automatic doors that rise and fall.
★ External side of the tunnel with acid mist outlet, connected to the acid mist tower duct;
★ Observation window on the side of the tunnel at the operating surface.