Question-and-Answer Resource for the Building Energy Modeling Community
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Most of the controls that are there are there to control whether a window is opened or closed, and not about how much flow there is. There may be a way with EMS to provide the exact control you're asking for, there are other questions/answers about that.
When flows are too large then it is likely that either
Or it could be both. The first problem can be addressed by adjusting flow coefficients (it depends on which object you're using) or using the "Window/Door Opening Factor, or Crack Factor" field of the "AirflowNetwork:MultiZone:Surface" object. Assuming you're using one of the window objects, using an opening factor of 30/136 limits the window opening to a quarter of what it could be, so you should (hopefully) get about a quarter of the flow. If there aren't any wind issues and that reduces the flows, you'll still probably have to play with that some to get what you want. To check out potential wind problems, check your weather file to make sure the wind speeds aren't crazy and check that there isn't a wind pressure coefficient problem (if your Wind Pressure Coefficient Type is "Input").
It'd help to know which objects you're using, but generally those are the things to look at.
