For medical buildings that are governed by ASHRAE 170 the airflow
requirements are a bit different. The standard not only mandates minimum OA
flowrates but also general airflow rates (often times 6 ACH or higher). This
airflow rate is typically higher than the autosized rates based on a 20F
differential. It seems like the baseline should use the required flowrates
like the proposed, but has anyone gone through this with a LEED reviewer.
Basically it would mean that the minimum flowrate in the VAV spaces would be
100% resulting in a lot of reheat energy.

Thanks,

Steve