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For the first question: This problem has been solved by adding a new senor(for example Vent_schedule) in the venting schedule(you need to define this schedule at first), and use this senor as a condition in the EMS:Program. Just add a condition: if vent_schedule==0 then : set openfactor=0

With this method, the airflow network opening can be controlled by the venting schedule.

Next: the EMS can override the venting schedule in define, so the only way to control the opening by time is the method above.