I use 3D plant for Coal Processing Plant detail design, most of the equipment use chute and rectangular ducting as solid transfer, how to set up rectangular duct in 3D plant.
Unless AD has released a new catalog, there is no option for duct work. You could create custom components, but I would imagine it would be a good bit of work. If you look at the spec editor, there are placeholder box fittings, but I didn't see any options for straight box shapes. You'd have to build it custom.
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