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ASHRAE standards 90.1-2010 and 189.1-2009 require demand control ventilation (DCV) in some cases. ASHRAE standard 62.1-2010 allows demand control ventilation but places restrictions upon its application. Many existing installations do not comply with the requirements of ASHRAE Standard 62.1-2010 yet there is pressure to reduce ventilation using various techniques including carbon dioxide based demand control. This paper addresses what is required and what strategies and technologies can be used to meet the requirements of the all the standards. Many past approaches to DCV cannot be used if one is to try to comply with ASHRAE 62.1-2010. These approaches are identified and new approaches are listed that will meet the requirements of all three standards.