Zone extracts are placed at the HVAC zone level and are used to return air back to the AHU. To place an extract, navigate to the HVAC zone, click on the Add zone extract tool. Then, making sure that the cursor is inside the boundary of the zone, left click with the mouse to place the extract.
The extract unit will be automatically positioned near the top right of the zone:
Note: A zone extract is required in an HVAC Zone if an ADU has been placed.
The Zone extract does not require any data to be entered and so does not appear on the Navigator list. It is not to be confused with the Zone exhaust fan which is used to extract air direct to outside and can be linked to the Airflow Network.