IEQc2: Increased Ventilation

700 ppm is still an appropriate target for demand controlled ventilation, regardless of the design ventilation rate. With a properly functioning system, the amount of ventilation air supplied to spaces with CO2 sensors will end up matching occupant loading and will be decoupled from the peak design value (e.g. 20 cfm/person). Increased ventilation will have more of an impact on spaces that don’t have CO2 sensors and likely result in CO2 levels less than 700 ppm.

Hi Conrado This is a question for ASHRAE 62.1 2007, and more specifically, we find the ASHRAE 62.1 2007 User’s Manual to be super helpful in navigating this credit. The credit addresses the system capacity to supply that 30% extra outside air. It doesn't stipulate CO2 levels that trigger the call for more outdoor air -- that will depend on the ambient conditions and activity levels of your project. Roger is correct that CO2 sensors support demand control ventilation for some spaces while this credit intent is to include all spaces. Check out the User's Manual (Appendix A) for CO2 set point and see if it's helpful. Good luck