In addition to dealing with fumes from a variety of different materials, we are sometimes required to deal with other additional hazards, including steam and oil mist. We are often asked to provide background or general ventilation in production facilities. These general extraction systems deliver the optimum air change rate within the work space, to create a clean air atmosphere. This arrangement provides extraction from production machinery for the removal of fumes generated by the process. Fume extraction for the printing process is a typical example.