![](http://www.alamy.com/thumbs/6/674ED757-9B53-43AF-BECF-DEA3E897CCC1/2B4E5R2.jpg)
Germany, Black Forest, Hornisgrinde, ventilation system
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Photo credit: © Roland T. Frank / Alamy / Afripics
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Keywords: aeration, air, baden-wurttemberg, baden-wurttemburg, baden-ürttemberg, black, engineering, exhaust, focus, forest, germany, hornisgrinde, liner, pipe, pipeline, probe, sensor, stainless, steel, system, technic, technical, technique, techniques, technological, technology, tube, ventilation