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Air Terminal

This rule checks whether Air Terminals have valid and expected flow values. Proper airflow settings are essential for correct system design, performance calculations, and coordination with mechanical systems.

What Is Checked

DAQS reviews the flow value assigned to each Air Terminal element. This includes:

  • Presence of a value (not left blank or zero unless intended)
  • Consistency with system design (compared to expected values, if defined)
  • Parameter location (instance vs. type parameter)

⚠️ Missing or incorrect flow values can disrupt total system balancing, ventilation analysis, and cause coordination issues during MEP validation.

Why This Matters

Correct flow data ensures:

  • Accurate HVAC load calculations
  • Proper air distribution balancing
  • Reliable MEP clash detection and sizing
  • Clear documentation for fabrication and installation

How to Fix

  1. Select the Air Terminal in Revit.
  2. Go to the Properties palette.
  3. Locate the Flow parameter (usually under Mechanical → Airflow).
  4. Enter the correct flow rate in liters/second (L/s) or cubic feet per minute (CFM) depending on your project standards.
  5. Confirm that the value is set at the instance level if terminals vary per location.

Tip

Use schedules to quickly identify missing or zero flow values across multiple terminals. Consider setting default flow values in the family type if applicable.

If your project uses custom flow parameters or units, let us know so the rule can be adjusted accordingly.