a system of ducts used for a particular purpose, as in a ventilation or heating system.
the pipes, vents, etc., belonging to such a system.
Also, ducting.

1930–35; duct + work

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He says that sensors are cheap enough now that they can be distributed
  throughout a building, even in the ductwork.
When doing ductwork, be sure to get professional help.
Round ductwork is also stiffer than rectangular and therefore much quieter
  during operation.
These are common locations to find leaks and disconnected ductwork.
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