Classification of a room as "densly occupied"

Hi, We have a project, where there are large directors' offices. In general, only one person will be working there, but there will be tables with 6 chairs, so let's say additional 6 people can be in this office for some time during the day, from time to time. The office is private office, it is not a meeting room. If we divide 7 people over the area of the room - we come into "densly occupied space". We have CAV system there and the amount of fresh air is calculated based on the 7 people in the room, so even if we have only 1 director in the office, there is a lot of fresh air provided. The system is 100% OA. Should we provide the CO2 sensors there and treat the space as "densly occupied"? Many thanks !