Demand Control Ventilation (DCV) refers to varying the breathing zone outdoor airflow to the occupied spaces of a building based on the actual or estimated number of occupants and/or ventilation requirements of the occupied zone. This course will review the history of ASHRAE standards and the development of DCV. It will discuss the different DCV strategies. It will consider the links between ASHRAE & LEED 2009 and the relationship between CO2, outdoor air ventilation and IAQ/IEQ. It will also discuss enhanced DCV strategies including implementation of best practices using airflow measurement technologies.