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FCS3263: Energy Efficient Homes: The Duct System

Figure 1. Common Air Duct Problems: A= Leaky connections; B= Leaky return; C= Furniture blocking registers; D= Leaks at furnace and air-filter slot and duct-tape failures; E=Fallen duct insulation; F=Leaky supply ducts; G= Kinks restricting airflow.

Credit: http://www.energystar.gov