I am new to the ASHRAE MZ62 calculator and I am not clear on how to write the narrative regarding :
Ds - If not all zones are entered, provide a description of how the system Ds value was calculated, and confirm that it accounts for the percent of total design airflow to each zone at the condition analyzed (zone Ds), and the primary air fraction of supply air to each zone (Ep) at the condition analyzed.

Any thoughts?