Ducts can be insulated either from the start, or the insulation can be inserted in a duct after it has been drawn.
In the start duct dialog you will find a tab called Insulation Duct Representation
Insulation from duct start.
Insulation to be inserted in finished duct | Insulation can be inserted while you draw the duct (context menu) |
Insulation can be started and ended with the same function. If you want fire insulation on each side of the wall, help lines may be useful
See chapter 8 Pipes
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