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