Indoor air quality is now more important than ever before, especially as people spend the majority of their time inside homes or workplaces. A key ingredient that influences indoor air quality may be the cleanliness of the air ducts—the hidden network that circulates heated or cooled air after a building. https://kanban.xsitepool.tu-freiberg.de/PrmBPCsLTxCN6M388R4t4A/