Skip to main content

Set CFM Total In a Duct

The Set CFM Total In a Duct command is used to set the total airflow in a duct. The airflow is distributed to all of the diffusers connected to the selected duct.

To set the total airflow of diffusers connected to a single duct, go to
Ribbon: DM HVAC→Diffusers→  Set CFM Total In a Duct
Pulldown Menu: DM HVAC→Set CFM Total→In a Duct

You will be prompted to select the duct for which the total airflow for all connected diffusers is to be set.

Select duct or label:

The Adjust Duct CFM Total dialog box will appear.

Adjust Duct CFM Total Dialog Box​

  •  Old CFM: The current airflow through the duct.

  •  New CFM: The new airflow for the duct.

See the CFM Setting Adjustment Methods section for more information about the 🔘 Average CFM in Diffusers and 🔘 Prorate CFM in Diffusers settings.

Setting the Total Airflow in a Duct​

When the values in the dialog box are set correctly, press the button. The new CFM value will be set in the diffusers connected to the duct.