The system of acid fumes collecting and exhausting, is based on the principle of  keeping under negative pressure all the tunnel enclosure where the pretreatment tanks are placed. This offers different advantages as:

         ● Much lower installed power with full vapors collecting efficiency (at same capacity conditions);

         ● Simpler installation of all the tanks and lower chance of damaging the PPH ducting as there are no more ducts or pipes to be    damaged;

         ● Totally safe and acid vapors free positioning of the operator inspecting the materials being processed in the tanks;

         ● Lower cost of equipment necessary to reclaim the working area.