Can a building use DCV under ASHRAE 62.1?

• A. Yes, provided IAQ remains within acceptable criteria.
• B. No, DCV is not permitted under 62.1.
• C. Only when the space is a laboratory.
• D. Only with an addenda approved by the authority having jurisdiction.

Answer: (A)

Demand Control Ventilation (DCV) is allowed under ASHRAE 62.1 as an energy-saving option, as long as the outdoor-air delivery continues to meet the IAQ criteria defined by the standard. In practice, DCV modulates outdoor air based on occupancy or CO2 levels, so you can reduce OA when spaces are less occupied while ensuring the ventilation rate still satisfies the minimum requirements and the IAQ remains within acceptable limits. It isn’t limited to laboratories, and you don’t need a special AHJ addenda to use DCV—compliance is about maintaining IAQ while staying within the minimum ventilation rates.