1.   A furnace first heats air, then a fan pumps the hot air through metal ducts to floor registers in various rooms in the house.

2.   First, attach the end of the insulated ducting to an eight-inch length of galvanized metal duct.

3.   Heavy-duty work gloves are essential when handling metal ducts.

4.   If so, this could by corrected by insulating the metal duct where it goes up through the attic.

5.   Should the metal ducts be covered with some kind of insulation to cut down on the waste of energy?

6.   The basement is large and unheated so these metal ducts lose a lot of heat on their way to the furthest rooms.

7.   The dampers are little metal handles in the metal ducts.

8.   To dampen that sound, cut a short piece out of the metal duct and put in a canvas sleeve connecting the two metal sections.