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Carbon dioxide (CO2)-based demand controlled ventilation (DCV) is increasingly used to modulate outside air ventilation based on real-time occupancy. Its use could potentially become as common as thermostatic control is today. This article summarizes the current state of the art in CO2-based ventilation control including a brief discussion of the technology used, its reliability and how it is best applied. Like any control approach, the success of a CO2-based DCV application is dependent on how it is engineered and installed.


Citation: ASHRAE Journal, vol. 43, no. 2, February 2001