You can model the corridor as a return plenum or you can use zonemixing. This question question can help you on your way.

You can model the corridor as a return plenum or you can use zonemixing. This question question can help you on your way.way: [https://unmethours.com/question/12784/is-it-possible-to-model-an-airloop-with-zones-in-series-instead-of-in-parallel-in-e/]