In a number of operating processes, contamination by suspended particles is not acceptable. These operating processes take place in clean-rooms. Extreme cleanliness is required in particular when handling doped semiconductors, medical products and surgical instruments. Clean-rooms are characterised by the equipment as well as by hermetic sealing and ventilation with purified air via ventilation systems that ensure special flow conditions and constant overpressure in the room. Diener electronic has a clean-room certified according to DIN ISO 14644-1 for process development and surface treatment service of components used in semiconductor technology, medicine, chemistry and analytics.