Use measured airflow rate in DOAS?

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EnergyPlus will typically operate the fan to meet the load the system sees (either ventilation, heating, or cooling).

Since your DOAS operates only to meet the ventilation requirement, you can set the ventilation requirements using the DesignSpecification:OutdoorAir object's Outdoor Air Flow Rate Fraction Schedule Name field.

You can also set the flow rate of the fan directly using an EMS Actuator on the "Fan Air Mass Flow Rate".