A common belief is that opening two windows or doors inside the home can create a strong and steady flow of air (a "draft") that a single window would not create. This seems somewhat intuitive, yet I have not been able to find a rigorous explanation. 

Is this true? If so, how do the mechanics of this work? How does the effect depend on the positioning of the windows relative to each other? Additionally, how is it changed by the addition of more than two open windows?

Are there any other factors?


(Note: If I am asking this on the wrong stackexchange site, please tell me where to ask it instead.)