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Example 1: tie-in to heat
plenum for circulation throughout all rooms
Example 2: tie-in to
part of the duct system
Figure 27: Examples of air circulation
when tying-in to existing ductwork
45° tie-in
Central heat blower
Blower
Deflector
Cold air
return
Cold air
return
Furnace
Furnace
Figure 28: Example tie-ins to A) central heat duct and B) central heat plenum
OPEL AP
OPEL AP
OPEL AP