Skip to main content

Set CFM Total In a Room

The Set CFM Total In a Room command is used to set the airflow values for all of the diffusers in a room. The recommended airflow values are based upon the heating and cooling loads specified in the room.

To set the total airflow in a room, go to
Ribbon: DM HVAC→Diffusers→ Set CFM Total In a Room icon Set CFM Total In a Room
Pulldown Menu: DM HVAC→Set CFM Total→In a Room

You will be prompted to select the room in which to set the total airflow.

Specify point inside room:

The Set CFM Total in a Room dialog box will open.

Set CFM Total in a Room Dialog Box​

Set cfm total in a room dialog box

  •  Room: The name of the selected room.

  •  Type: The room type of the selected room.

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

Supply Air​

  •  Room Minimum CFM: The Minimum Supply Air specified in the room itself or the schedule. Visit the Rooms section for more information.

  •  Cooling CFM: The airflow required to cool the room based upon the cooling load. Visit the Cooling, Supply CFM value in the Print Supply Air Requirements section for more information.

  •  Heating CFM: The airflow required to heat the room based upon the heating load. Visit the Heating, Supply CFM value in the Print Supply Air Requirements section for more information.

  •  Required CFM: The airflow required in the room. This value is the largest of the Room Minimum CFM, Cooling CFM, and Heating CFM values.

  •  Current CFM: The current supply airflow in the room. This value is based upon the CFM values of the supply diffusers in the room on the drawing.

  •  New CFM: The new supply airflow to be set in the room. This value will be distributed among the supply diffusers based upon whether 🔘 Average CFM in Diffusers or 🔘 Prorate CFM in Diffusers is selected.

Return / Exhaust Air​

  •  Current Return CFM: The current return airflow in the room. This value is based upon the CFM values of the return diffusers in the room on the drawing.

  •  New Return CFM: The new return airflow to be set in the room. This value will be distributed among the return diffusers based upon whether 🔘 Average CFM in Diffusers or 🔘 Prorate CFM in Diffusers is selected.

  •  Current Exhaust CFM: The current exhaust airflow in the room. This value is based upon the CFM values of the exhaust diffusers in the room on the drawing.

  •  New Exhaust CFM: The new exhaust airflow to be set in the room. This value will be distributed among the exhaust diffusers based upon whether 🔘 Average CFM in Diffusers or 🔘 Prorate CFM in Diffusers is selected.

Setting the Total Airflow in a Room​

When the values in the dialog box are set correctly, press the button. The new CFM values will be set in the diffusers in the room.