HVAC Editor Window
- Last UpdatedSep 15, 2025
- 13 minute read
All of the tasks carried out that are associated with the creation or modification of HVAC are initiated from a central HVAC Editor and HVAC Components Editor windows which act as a task hub.

New HVAC Element
The HVAC administrative element and associated branch element are displayed in the model hierarchy. These elements must be created below an existing HVAC zone element. The HVAC element(s) are a starting point for branches and can own a number of branches with differing specifications with any number of ends and components.

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Name |
The name of new HVAC element is auto generated as per project rules; if required you can enter another name for the new HVAC element. |
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Primary System |
Use to select the primary system to which it belongs; the default is No System. |
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Standard |
Use to select the required standard. A Standard contains specifications and additionaly custom settings governing the default sizes and materials for custom pieces. To show only specific standards in the Standard list, standards can be set hidden or visible in the Paragon module. For information about how to hide standards in the Paragon module, refer to HVAC Standards. |
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Specifications |
Use to select the required specification. By default, this specification will be used but an alternative specification can be selected from the Branch pane of the HVAC Editor window for individual HVAC branches. There are three example specifications supplied - one rectangular (AVEVA-RECTANGULAR) and two circular (SIMDUCT-CLASS-C and SIMDUCT-CLASS-F, both circular specifications are the same except F is the fireproof specification). You can change the dimensions but not the specification. Components of different, fixed dimensions may be chosen from the specification.However, the straight components can be modified as this could occur on site. There is also a custom specification where you can modify any dimension on the HVAC components to suit your requirements. Note: |
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Insulation |
Use to select the required insulation. This functionality can be applied to the current element and to a range of components. The default is None. |
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Custom Settings |
This functionality is enabled once the Custom specification is selected from the Specification drop-down list.
Use to select the required custom settings for the new HVAC element. Note: |
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Set working HVAC |
Sets the currently selected HVAC, from the Model Explorer or 3D graphical view, as the working HVAC. |
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Create new branch |
Use to create a new HVAC branch in the model hierarchy below the currently selected HVAC element. |
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Branch Connections |
The branch connections pane is automatically displayed in the HVAC Editor window with the head and tail positioned but not connected.
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Branch Element
The Branch pane of the HVAC Editor window is populated with the auto-generated name of the branch and the specification of the HVAC element.

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Name |
The name of new HVAC branch element is auto generated as per project rules and with reference to it’s owning HVAC element in the hierarchy; if required you can enter another name for the new HVAC element. |
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Specification |
The specification of the owning HVAC element is displayed. |
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Insulation |
The insulation selected for the owning HVAC element is displayed. |
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Custom Settings |
If the owning element’s specification has been selected as Custom, this functionality will not be greyed out; the custom settings for it’s owning element is displayed. |
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Close this form and open Create HVAC Component form |
Use to close the HVAC Editor window and open the HVAC Components Editor window populated with HVAC components available for selection as defined by the selected specification. |
Branch Head/Branch Tail
Use the functionality available from the Branch Head/Branch Tail pane of the HVAC Editor window to define the branch head/ branch tail settings (how the branch head/branch tail will be connected and positioned. By default the Branch Head tab is displayed).
Note:
The functionality available from the Branch Head tab and Branch Tail tab are identical,
therefore only the functionality for Branch Head will be described.

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Position (Unconnected) label |
The branch head is positioned at the default co-ordinates 0,0,0 (origin) but is not connected to any HVAC components. Note: |
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Switch values between head and tail |
Switches all the data entered in the HVAC Head and Tail pane of the HVAC Editor window between the HVAC branch head or the HVAC branch tail tabs. |
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Disconnect head |
Disconnects the branch head from the element it is currently connected to. |
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Reconnect head |
Reconnects the branch head that has moved position away from what it has been connected to. Not available for this release. |
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Pick Branch in laser data to set head to |
Use to connect the laser data to position the head or tail of the HVAC branch at a position derived from the point cloud data. Note: |
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Pick item to connect head to |
Connects the branch head to a selected element. |
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Connect head to first branch member |
Connects the branch head to the first branch member. |
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Rectangular |
Defines the branch head shape as Rectangular. The width and depth fields are automatically populated with dimensions governed by the selected specification. If required these dimensions can be switched. |
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Circular |
Defines the branch head shape as Circular. A diameter field is automatically populated with a dimension governed by the selected specification. |
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Flat Oval |
Defines the branch head shape as Flat Oval. A width and depth fields are automatically populated with dimensions governed by the selected specification. |
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Direction |
Specifies the direction that the HVAC will take from the branch head. Valid dimensions for the head direction are E (East), N (North), U (Up), -E (negative East), -N (negative North) or -U (negative Up). |
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Z Axis (HZAXIS) |
Use to define the Z direction, typically the ‘up’ direction) of the HVAC branch head (this ensures any selected component’s Z axis aligns as expected with the branch’s head Z axis) |
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Reverse Direction |
Use to switch the direction of the HVAC branch head. |
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Position |
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Format |
Select the position format - ENU, XYZ or Grid.
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WRT |
Positions the HVAC branch head WRT to the named design element, for example the World, Zone. |
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Display positions as offset from nearest grid plane |
Displays the picked position as an offset from the nearest grid. |
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WRT current element |
Positions the HVAC branch WRT to the currently selected element. |
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WRT CE owner |
Positions the HVAC branch WRT to the currently selected element’s owner in the model hierarchy. |
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WRT world |
Positions the HVAC branch WRT to the WORLD element in the Model hierarchy. |
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WRT picked element |
Positions the HVAC branch WRT to the picked element in the 3D view. |
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Picked position |
Positions the HVAC branch WRT to the picked position in the 3D view. |
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Offset |
Positions the HVAC branch at an offset distance from a known position.coordinates for the known Enter the co-ordinates for the known position, in the format selected.
Select Offset.
Enter the co-ordinates for the offset or pick the position in the 3D view. |
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Nudge |
Nudges the new HVAC branch by a defined distance to the right or to the left in the 3D view.
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HVAC Components
HVAC Components are single pieces of HVAC used together to create a HVAC design. It is usual to build up the HVAC design by adding components sequentially, starting at the branch head, and positioning and orientating each component as you proceed. You can insert a component into an existing sequence by navigating to the item immediately before the required location and then creating the new component.
There are many different combinations of HVAC component that can be created; because of this the HVAC application uses a common layout for the windows that are presented. For the same reason this document only includes a detailed description of how to create one specific type of HVAC component. The information can be applied to the same processes that are used to create all other types of HVAC component.
HVAC Components Editor Window
All HVAC Component windows are dual-purpose windows used to either Create a new HVAC Component element (by default) or Modify the attributes of an existing Component element.
Referring to the HVAC Hierarchy section, an HVAC Component must reside below an existing HVAC Branch element.
Depending upon which specification is selected; different HVAC components are displayed in the HVAC Components Editor window.

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Branch |
Use to return to the HVAC Editor window to modify HVAC or branch attributes. The name of the currently selected branch selected in the model explorer is also displayed. |
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Back |
Select to return to the HVAC Editor window. |
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Create |
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Specification |
The specification selected in the Branch pane of the HVAC Editor window is displayed in the specification field. Note: |
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Insulation |
The insulation specification selected in the Branch pane of the HVAC Editor window is displayed in the Insulation field. |
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Custom Settings |
If the Custom Specification/ Custom Settings is selected in the Branch pane of the HVAC Editor window, the setting is displayed in the Custom Settings field. |
Select the required HVAC component from the pictorial representation of the available components for selection governed by the specification.
Note:
For a fixed specification component, this section of the form is a list where if more
than one component is available at that size and shape, the components are listed
and can be re-selected. If the component being modified is a parameterized 'custom'
component, then the dimension image is shown and its dimensions may be changed interactively.

From the Modify pane of the HVAC Component Editor window, the specification can be changed if required. The HVAC component is displayed in the Model Explorer and the description of the selected component is also displayed in the HVAC Component Editor window.
If length is a variable dimension for the selected component, it can be edited in the Current Length box.
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Modify |
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Set straight length to standard gap length |
Sets the default Current Length to the same value as the standard gap length defined in the specification. Gap Manager uses this component length to fill gaps. |
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Fit to previous and next |
Automatically adjusts the straight length to fit between the previous and next components. |
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Equal size - Click to select from all sizes |
Limits the selection of components to include only components of equal connecting size. |
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All sizes - Click to select from equal size |
Enables selection of components of all connecting sizes. The columns values can be
filtered, and available columns depend on the selected component type. If a new component of an unequal connecting size is added, it will be positioned a short distance away from the previous component so that the gap can be manually filled with fitting components. If an existing component is replaced by selecting a new size from the list, the positioning is not changed. |
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Position |
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Position through branch head |
Aligns the selected HVAC component through the branch head. |
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Position through previous element |
Aligns the selected HVAC component through the previous HVAC component of the HVAC branch. |
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Position through next element |
Aligns the selected HVAC component through the next HVAC component of the HVAC branch. |
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Position through branch tail |
Aligns the selected HVAC component through the branch tail. |
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Connect to previous component |
Connects the selected HVAC component to the previous component. |
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Connect to next component |
Connects the selected HVAC component to the next component. |
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Distance - Clear to use Clearance |
Displays the actual clearance. To change the clearance input a new value into the text flied then press Enter. |
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Position through Pick |
Initiates the same functionality as that available from the Align with Feature on the Model Editor handle. the Position through Pick functionality is common through AVEVA E3D Design.This functionality allows alignment of the top or bottom of duct, or the top or bottom of insulation, if present, to be aligned with existing model features. |
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For use with the Offset functionality, to offset the selected position form the top of duct/bottom of duct. Note: |
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Other |
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Copy current component |
Copies the currently selected HVAC component. |
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Copy picked component |
Opens the Identify Component message box. Select a component to automatically connect it after the current component. If the size and shape of the components do not match, an error message is shown, and the picked component is placed a short distance from the current component. |
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Swap arrive and leave points (flip) |
Flips a component. |
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Direction |
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Direct Component |
Use the Direct functionality to modify the direction of HVAC elbow and bend components.
Axes are displayed in the 3D view, dependent upon which direction is selected on the power compass.
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Rotate Component |
Use the Rotate functionality to rotate HVAC tees and other non-symmetrical components such as bends or reducers.
Axes are displayed in the 3D view, along with an angle representation dependent upon which angle is selected on the power compass.
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Position Component |
Use the Position Component functionality to position HVAC components, input a value in the text field and select the direction from the Direction Power Wheel.
Up, Down, Right and Left axes are displayed in the 3D view. Note:
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When positioning a sub component |
A bar is displayed next to the positioning arrows, use to position the subcomponent to the respective edge of the owing straight element. Note:
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Direct to head branch |
Positions the currently selected HVAC component directly to the HVAC head branch. |
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Direct to previous element |
Positions the currently selected HVAC component directly to the previous HVAC element. |
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Direct to next element |
Positions the currently selected HVAC component directly to the next HVAC element. |
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Direct to branch head |
Positions the currently selected HVAC component directly to the HVAC branch head. |
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Direct to Pick |
Positions the currently selected HVAC component directly to the picked HVAC component. |
























































