IEQp1 using indoor packaged DX units

I'm in a bit of a funk. I have a office space that populates two floors of a building. Each space is using one existing packaged DX indoor system per floor and will distribute heating via individual VAV boxes (some existing some new) in each room. Since this would be considered a mechanical ventilation multi-zone unit, according to IEQp1, how would I go about finding the Design Outdoor Air Intake Flow (or Outdoor Air intake provided for system) for each packaged unit if they are not an outside air conditioning system? Any help would be appreciated.