Natural ventilation

Most all of our buildings have a combo of mechanical ventilation (e.g. in hallways) and natural ventilation (e.g. in residence hall rooms). I am trying to figure out what I need to provide to show that the natural ventilation system design meets the recommendations of the CIBSE guide and also trying to figure out which recommendations/calculations I'm supposed to be following. There are some simpler suggestions in chapter 2 "developing the design strategy" and complex calculations in chapter 4 "design calculations."