• Revit

Interrogate system information with the system inspector

Review the system inspector and how it is used for system information and to make design changes.

Type:

Tutorial

Length:

4 min.

Tutorial resources

These downloadable resources will be used to complete this tutorial:

ModelSysDsgn_RVT.6-02_2024-001.zip

Step-by-step guide

Review the System Inspector and how it is used for system information and to make design changes.

  1. Open the project M06_02.rvt.
  2. Ensure that the current view is HVAC > Floor Plans > 1 – Mech.
  • The Revit interface, with the project for this example open to the HVAC floor plan view.
  1. In the system FCU04 Supply, select a section of duct.
  2. From the Duct Systems contextual ribbon tab, click System Inspector.
  • In the floor plan view, a section of duct from the supply system is selected, and on the Duct Systems contextual ribbon tab, in the Analysis panel, System Inspector is selected.
  1. From the System Inspector panel, click Inspect.
  • The System Inspector panel expanded from the ribbon, with Inspect being selected.

The red arrows to air terminal 24 indicate the critical path for this system.

  • In the floor plan view, red arrows to air terminal 24 indicate the critical path for this system.
  1. Continue to move your pointer across the system and observe the range of information available from the System Inspector.
  2. Place your pointer over air terminal 24 and note the Excess Pressure value of zero.
  • In the floor plan view, the pointer hovering over air terminal 24 to display a range of information in red in a text box, including an Excess Pressure value of zero.
  1. Place your pointer over other air terminals and note the higher values.
  • In the floor plan view, the pointer hovering over air terminal 23 to display an Excess Pressure value that is greater than zero, this time in a blue text box.

This information can be used at a later stage to apply values to dampers in the system.

  1. Click Finish to close the System Inspector.
  2. From the Modify panel of the ribbon, click Split Element.
  3. In the main run of duct, just after air terminals 24 and 26, create a split.
  • In the floor plan view, a split being created in the main row of duct, just after terminals 24 and 26.
  1. Change the duct size to air terminals 24 and 25 to 8".
  • In the floor plan view, the ducts to air terminals 24 and 25 have been selected, and on the Options Bar, in the Diameter drop-down, 8 inches is being selected.
  1. Change the duct size to air terminals 26 and 27 to 6", including the flex duct.
  2. Use the System Inspector again to check the critical path and the Excess Pressure value at air terminal 27.
  • In the top left, the expanded System Inspector panel shows Inspect was selected; and in the floor plan view, the pointer is hovering over air terminal 27 to display the critical path and Excess Pressure value.
  1. Close the System Inspector.
  2. Zoom into the area around air terminal 23.
  3. From the ribbon, Systems tab, HVAC panel, click Duct Accessory.
  • A portion of the ribbon showing the Systems tab. In the HVAC panel, the Duct Accessory tool is being selected.
  1. From the Type Selector, choose the round damper.
  2. In the ductwork at air terminal 23, click to place the damper.
  3. Select the damper.
  4. In Properties, change the Pressure Drop to 0.
  • In the floor plan view on the left, the damper at air terminal 23 has been selected, and in Properties to the right, the Pressure Drop value has been changed to zero and is highlighted in red.
  1. Use the System Inspector to check the Excess Pressure value at air terminal 23. The value should be 0.05.
  • In the top left, the expanded System Inspector panel shows Inspect was selected; and in the floor plan view, the pointer is hovering over air terminal 23 to display the Excess Pressure value of 0.05.
  1. Close the System Inspector.
  2. Select the damper.
  3. In Properties, change the Pressure Drop value to 0.05 to match the Excess Pressure value at the air terminal.
  • A portion of the Properties panel, with the Pressure Drop value changed to match the Excess Pressure value at the air terminal.

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