Organizing Duct System Components by Level in Revit Made Simple

How to Arrange Duct System Components by Level in Revit

In a Revit model, duct systems are classified into four categories based on their operating pressure: micro pressure, low pressure, medium pressure, and high pressure. The classification depends on the working pressure range (P, Pa) and the sealing requirements. High-pressure duct systems are assigned the highest level, medium-pressure systems are positioned in the middle, while low-pressure and micro-pressure systems have lower levels.

There are two methods to assign levels to duct systems within Revit’s software interface:

• Using a detailed schedule to customize the level attribute in the duct system type properties.
• Adding custom parameters through project parameters and controlling levels via the duct legend, allowing different duct components to display various levels.

When you open a project file, several duct systems are visible in the Project Browser. Based on level requirements, the classification might be:

• Exhaust and smoke exhaust systems as high-pressure systems.
• Exhaust, supply and return air, staircase pressurization, and fire supplement air systems as medium-pressure systems.
• Fresh air systems as low-pressure systems, as illustrated below.

First Method: Setting Levels via Type Properties

Follow these steps:

1. In the Project Browser, navigate to Duct System. Select EA Exhaust System, right-click and choose Type Properties. In the dialog box, under Identity Data, add a remark such as Medium Pressure System, then click OK. (See image)
2. Repeat this process for other duct systems, annotating their respective levels in their type properties.
3. Create a new schedule filtered exclusively for duct systems. Add relevant families, types, system names, and level descriptions as part of the schedule setup. (See image)

This approach allows you to assign custom levels to different duct systems—low, medium, and high pressure—via detailed schedules.

Second Method: Using Project Parameters and Duct Legends

Follow these steps:

1. Go to the Manage tab and open Project Parameters. In the parameter properties dialog, create a new parameter named Level, group it under Model Properties, and associate it with duct system components by filtering the related categories. Click OK. (See image)
2. In the plan view, select the main duct of a specific system, for example, the PPY Exhaust and Smoke Exhaust System. In the Properties panel under Model Properties, enter High Pressure System in the new Level field and confirm. (See image)
3. Repeat this step to assign appropriate levels to other duct systems, updating the Level property accordingly.
4. Navigate to the Analyze tab, select Color Legend then Duct Legend. In the dialog box, choose a color scheme and confirm. (See image)
5. Click on the legend in the interface, then select Edit Plan in the modification panel. Create a new scheme named Duct Color Fill – Level. Set the title to match and assign the color scheme to the Level parameter. Use the “+” and “–” buttons to add entries such as Medium Pressure System and Low Pressure System, removing any irrelevant data. Confirm your changes. (See image)

Using this method, you can add custom levels via project parameters and visually represent the three duct system levels through duct legends.

Both methods can be applied depending on your project’s specific needs to set appropriate levels for different duct system components.

Related Topics

How to Solve Continuity Issues When Drawing Ducts or Pipes in Revit

How to Place Horizontal Air Vents on Ducts in Revit

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