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[EnergyPlus_Support] AFN - how to set up air tightness of envelope

Design Builder has generated me a wonderfully large AFN. As default, all my windows are closed all the time.

1) How do I realistically define an "air tightness" for windows that don't open?
2) For windows that do open, but are closed.

using AFN object fields such as minimum crack opening factor, etc. 

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I'm thinking of increasing the minimum crack width untill my zones are reporting infiltration rates of about 0.35 ACH (well sealed building).
Then I can add extra infiltration by playing with the openable windows and their schedules. 



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