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[EnergyPlus_Support] Does pressure coefficient affects on the closed openings?

Hello fellows 
When I use Airflow network class, I should enter the wind pressure coefficient for all the windows.
But in my model, most of windows are fixed(closed) and only some of them are operable. 
I calculated pressure coefficient values using CFD only for the operable windows. 
I suddenly wonder that pressure coefficient affects on the closed windows(fixed windows). 
I think when the opening is close, airflow rate can be calculated using empirical power-law fomula. So the pressure coefficient is not used. But can not sure what I thought is right or not. 
If my thoght is right, I can skip caculating all the pressure coefficient such a time consuming thing.

I hope that someone give me advice regarding this matter. 
Thanks in advance.




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