About Duct Settings

When Duct Settings is selected, the right pane displays a set of parameters that are common to all the duct systems in a project.

The Conversion branch below Duct Settings let you define default parameters that are applied separately to supply, return, and exhaust duct systems in your project.

Duct settings, duct sizes, and duct types can be copied to another project using the Transfer Project Standards feature.

Common Duct Settings

The following parameters specify the default duct types, sizes, and settings:

Angles

When Angles is selected, you can specify the fitting angle that Revit will use when adding or modifying duct.

Note: When manually creating a layout using a limited set of angles, you may notice that the selection point will be respected and the bend angle may be different from the preview.

Conversion

When Conversion is selected, you can specify parameters that control the elevations, duct size, and other characteristics for the ductwork created for the Main and Branch segments when using the Generate Layout tool.

Note: The Conversion Settings are also available from the Settings button on the Options Bar when creating a routing solution for your system’s ductwork.
You can specify the following default parameters for the branch ducts in the each system classification (Exhaust Air, Supply Air, Return Air):
  • Duct Type:

    This the default duct type for branch ductwork.

  • Offset:

    This is the height of duct components above the current level.

  • Flex Duct Type:

    This is the default type for flexible duct for branch ductwork (Flex Duct Round : Flex - Round, or None).

  • Maximum Flex Duct Length:

    This is the longest length of a flexible duct segment that can be used in routing solutions for branch ductwork.

Rectangular

When Rectangular is selected, the right panel lists rectangular duct sizes available for a project and shows which sizes can be specified from the Options Bar. Although only one value is used to specify duct size here, it can be applied to height, width, or both. The Delete Size button removes a selected size from the table. The New Size button opens the Duct Size dialog, where you can specify new duct sizes to be added to the project.

Oval

When Oval is selected, the right panel lists oval duct sizes available for a project and shows which sizes can be specified from the Options Bar. Although only one value is used to specify duct size here, it can be applied to height, width, or both. The Delete Size button removes a selected size from the table. The New Size button opens the Duct Size dialog, where you can specify new duct sizes to be added to the project.

Round

When Round is selected, the right panel lists round duct sizes available for a project and shows which sizes can be specified from the Options Bar. The Delete Size button removes a selected size from the table. The New Size button opens the Duct Size dialog, where you can specify new duct sizes to be added to the project.

You can select how size values will be used:

Calculation

When Calculation is selected, you can enable network based calculations and specify the method used when calculating duct pressure drop for straight segments.

On the Networks tab, click the checkbox to enable network based calculations for design parts so they are consistent with fabrication parts.

On the Pressure Drop tab, select a Calculation Method from the list. The options are: Altshul-Tsal Equation, Colebrook Equation, or Haaland Equation. The details of each calculation method are displayed in the description area.
Note: If third party calculation methods are available, they display in the drop-down list.