However, CO2-based demand-controlled ventilation (CO2-based DCV) systems can keep an acceptable indoor air quality with a CO2 setpoint of 1000ppm, and energy can be conserved in the indoor spaces where CO2 is suitableto reflect IAQ porformence.

• 在适合用CO_2浓度反映IAQ的环境中，采用CO_2需求控制通风能满足IAQ要求，而且节能。