Perimeter Duct Systems
A perimeter duct system is one in which the supply outlets are located around the perimeter (that is, outer edge) of the structure close to the floor of the outside wall, or on the floor itself. The return grilles are generally placed near the ceiling on the inside wall.
The two basic perimeter duct systems used in warm-air heating are (1) the perimeter-loop duct system, and (2) the radial perimeter duct system.
The perimeter-loop duct system (see Figure 7-1) is characterized by feeder supply ducts that extend outward from the furnace plenum to a loop duct running around the perimeter. Warm-air sup- ply outlets are located in the loop duct.
There is no loop duct in the radial perimeter duct system (see Figure 7-2). The feeder supply ducts extend from the furnace plenum to the warm-air supply outlets located on the outside walls or on the floor next to the outside walls.
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