Addendum 62u. This addendum adds requirements related to the control of ventilation systems. An improperly controlled system is unlikely to deliver ventilation air at design minimum levels. This addendum does not cover optional demand-controlled ventilation requirements. It specifically addresses VAV system controls for outdoor air intake airflow. The intake control requirements recognize that at low supply volumes sufficient outdoor airflow may not be maintained if a fixed outdoor air intake damper position is used. In many cases, an active outdoor air control system must be provided to ensure minimum intake rates are maintained.