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Demand-controlled ventilation (DCV) is widely used for the energy-efficient provision of indoor air quality. However, existing DCV requires a continuously variable airflow rate, and is not applicable to the constant-air-volume mechanical ventilation (generally in buildings with room air conditioners and free-running buildings). This study proposes a novel DCV for constant-air-volume mechanical ventilation. To achieve high ventilation efficiency, the proposed DCV operates the constant-air-volume mechanical ventilation continuously and intermittently at full-load/quasi-full-load and partial-load conditions respectively, which is controlled by the upper and lower concentration limits of indoor airborne pollutants (indicated by indoor CO₂ concentration). The larger upper and lower concentration limits are preferred for energy saving, but could deteriorate indoor air quality, and cause durability problems due to frequent on-off …