Natural Ventilation - Single Space

Almost all the spaces in our building is mechanically ventilated, except the entrance lobby which receives outside air through revolving doors. The revolving door opening area and the 8 m. rule are all sufficient for IEQp1, however, we find it difficult to present evidence for IEQc2. The credit requires that the flow diagram from Figure 2.8 is used to determine "natural ventilation is an effective strategy for the project." We are not using natural ventilation for the whole project, but only for 100 m2 out of 7800 m2. Also, airflow analysis is required in Option 2 of this credit. We are considering to present calculations showing that the revolving door provides a large enough volume of air to satisfy requirements. Would this be sufficient? Anybody with similar experiences? Thank you.