Filtration system helps keep new tenant, avoid ventilation overhaul
To comply with current ventilation codes, including minimum outside air requirements for increased occupancy, Highwoods had two options: follow ASHRAE 62's ventilation rate procedure or the recent interpretation of the standard's IAQ procedure. The latter "allows the use of any amount of outdoor air deemed necessary" if the designer can show that IAQ is acceptable to human occupants. If they chose to use the ventilation rate procedure, they would have needed to use 2,160 cfm of outside air for 108 people per floor, or 20 cfm of outside air per person per floor. But this method would have entailed extensive renovations, such as: