At the Zone level of the building tree, this Zone is specified as a Restroom or Shower rooms, under the Ventilation Function. Per table 140.1-B in the Code, you are required to specify the quantity, for the purpose of Mandatory exhaust requirements.
You can opt to change the Ventilation Function at the General Tab, or input the Quantity at the Mechanical Tab, along with the General Exhaust fan CFM being provided to meet this requirement.
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