HVAC Attributes - Connect
- Last UpdatedJan 07, 2026
- 3 minute read
The way that an HVAC component connects to the next and previous piece of HVAC in a sequence can be modified by using the first dropdown list in the Connect part of the HVAC Window:
Note: Some of the terms used in the following section are described more in detail in later sections of this guide.
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To Previous |
To connect pieces of HVAC which are not axially symmetrical (p-leave is always in the opposite direction to p-arrive - for example straights, tapers). |
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Leave East/West/North/South/Up/Down |
To connect a two way piece of HVAC which forces a change of direction (for example elbows, bends). |
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P3 is East/West/North/South/Up/Down |
To connect pieces of HVAC which have: Side connection - Threeways, Branch Connectors. Asymmetrical Two-way - Offsets, Eccentric Tapers. You must enter the required direction for P3 or Offset. |
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to Next |
Connect to Next piece of HVAC. |
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to Branch Tail |
Connect the piece of HVAC to Branch Tail of the next piece of HVAC. |
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To connect the head or tail of the current HVAC branch to another HVAC branch or component, select from the following dropdown list menu.
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In the left hand dropdown list select either the Head or Tail to modify.
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Then specify how to identify the point on an existing the HVAC branch or component to which the head/tail is to be connected.
Tail of ID Branch
You are prompted in the 3D View to Identify BRAN (any point on the branch).
Head of ID Branch
You are prompted in the 3D View to Identify BRAN (any point on the branch).
ID Branch Connector
You are prompted in the 3D View to Identify Branch Connector, see Create / Modify HVAC Side Branch Branch Connecters Branch Connectors and HVAC Categories and Available Types.
ID Threeway Piece
You are prompted in the 3D View to Identify Threeway or Tee Item, see HVAC Catalog and HVAC and .
ID Centrifugal Fan
You are prompted in the 3D View to Identify Centrifugal Fan.
Note: The p-arrive and p-leave points for a centrifugal fan are both on the rectangular flange face and the P3 is on the circular flange face, regardless of the flow direction through the fan. Refer to Inline Plant Equipment and HVAC Categories and Available Types.
ID Air Handling Unit
You are prompted in the 3D View to Identify Air Handling Unit.
Note: The P3 for an air handling unit is the auxiliary flange used, for example, the re circulation inlet, refer to Inline Plant Equipment and HVAC and .
ID Equipment Nozzle
You are prompted in the 3D View to Identify NOZZ, refer to Equipment Nozzles.
First Member
Specifies the Branch Head. Click to identify the first element in the existing branch.