For the primary-school reference building model, I am looking at the output table (Zone sensible cooling for entire facility, under HVAC sizing summary). I am trying to figure out how the user design air flow is calculated. It is more than the minimum OA flow, and different from the calculated design air flow. In the Zone sensible heating table, the user design airflow is same as the min OA. There does not seem to be anything in the input file that looks like cfm/zone has been entered - every design airflow field says autosize. I must be missing something blindingly obvious. Thanks as always for all the help.