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