questions about natural Ventilation simulation driven by thermocompression
 

hi, i am working on an natural Ventilation simulation driven by thermocompression in a gymnasium, but i do not konw how to set the boundry conditions on the door and windows of the building.
should i set these doors and windows as pressure out-let and pressure in let?
please help me and give advices if you konw about this.
thanks a lot!
andylin