Previous and Next Ducts

Other sections in the documentation refer to next and previous ducts. This section describes how to identify those ducts in your system.

These terms are used when discussing ducts that are connected to a specific duct you are working with. The duct you are working with is labeled Reference duct in the image below.

The previous duct is the duct that is toward the equipment from the reference duct. It is typically larger than the reference duct. For supply ducts, previous ducts are upstream from the reference duct. For return ducts, previous ducts are downstream from the reference duct. Ducts only have a single previous duct.

Next ducts refer to the duct that is toward the diffusers from the reference duct. It is typically smaller than the reference duct. For supply ducts, previous ducts are downstream from the reference duct. For return ducts, previous ducts are upstream from the reference duct. Ducts can have multiple next ducts.

next-previous

When the Return and Exhaust Arrow Direction option is set to Towards Fixtures, the previous duct is always the one that points to the reference duct. The next ducts are the ones that the reference duct points to.


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