According to F&S, Management Engineer, Mike Halm:

1. Currently, this unit is in occupied mode on weekdays, 6AM to midnight.  Normally the occupancy schedule will more closely follow the hours the building is open, but runtimes were extended across campus as a precaution during the pandemic.

2. When the building was originally designed, there likely wasn’t a set amount of air changes per hour applied to every classroom.  Typically for classrooms the heating and cooling airflows are determined based on the specific loads in each room, rather than applying a flat rate based on the volume of the room.  If it would help, we could share the original ventilation drawings from 1989.  Regarding the ASHRAE standards, any new construction or renovation work on campus should have mechanical ventilation provided in accordance with ASHRAE 62.1.  However, there were different codes and standards in place when this building was constructed 30 years ago.  The current version of ASHRAE 62.1 may have slightly different requirements than the codes in place when the building was built.