There are a few things you can look out for to determine whether your air ducts require cleaning. The signs of a dirty air duct include: Furnace filters need to be replaced frequently, Accumulation of dust on vent grills, Dusting around the house is required more frequently. Dirty air ducts lead to poor airflow in your home and can impact your overall health. If you suspect that your air ducts need to be cleaned, contact our team at Crestway HVAC today!