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January 2017 • SMT Magazine 99 Extraction and filtration units are deter- mined by type, composition and amount of pollutants; system utilisation in automated, semi-automated and manual production as well as mobility or flexibility. Modern extraction and filtration systems clean process air to such a high degree that the purified air can be moved back to the working area. This is based upon innovative filtration concepts, which can additionally be configured to special requirements. The capturing of airborne pollutants is an- other decisive aspect in air purification. Closest proximity to the source of pollution is of critical importance—the closer, the better. Not only to capture the majority of all particles but to mini- mise economic efforts. A general rule says that twice the distance between emission source and capturing element requires four times the exhaust performance in the extraction and filter system. Capturing ele- ments are nozzles mounted on extraction arms. They guarantee the ideal capturing of airborne contaminants. Due to pollution amount and type as well as airflow principles, they are available in various versions—up to complete housing solutions. Basically, the appropriate capturing element can deliver a substantial contribution to the quality of the extraction and filtration device. The degree of capture rate forms the basis for subsequent high-grade filtration, finally provid- ing high overall efficiency and low residue in the returned clean air. THE INFLUENCE OF CLEAN AIR ON THE VALUE-ADDED CHAIN IN ELECTRONICS PRODUCTION Figure 3: Selection of capturing elements.