The failure of systems to deliver the quantity of outdoor air specified in the design can be caused by outside conditions, poor damper control and operation, or the inadvertent closing of outdoor air intake dampers. Ultimately, since many commercial building ventilation systems are used to provide cooling and sometimes heating, it is important that the thermal control scheme is effectively integrated into a system that meets outdoor air supply requirements under all thermal load conditions. If your equipment and building is aging, it is important to talk to your solution sales representative to schedule a time for them to assess the air quality and energy optimization of your building.