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In the library section of the thermal zone tab in OpenStudio there is a group called Zone Ventilation Design Flow Rate. This object will translate to the EP ZoneVentilation:DesignFlowRate object which allows you to model natural ventilation. The fields of interest to you might be the minimum and maximum outdoor air temperatures to allow the ventilation to occur.

In the library section of the thermal zone tab in OpenStudio there is a group called Zone Ventilation Design Flow Rate. which contains an object labeled 'Natural Ventilation'. This object will translate to the EP ZoneVentilation:DesignFlowRate object which allows you to model natural ventilation. The fields of interest to you might be the minimum and maximum outdoor air temperatures to allow the ventilation to occur.