Using a ventilation controller to optimise residential passive ventilation for energy and indoor air quality

The results show that controlled passive ventilation and hybrid ventilation can be used in homes to provide equivalent IAQ to continuous mechanical ventilation, for less use of energy. On average, the controlled passive system saved 6% of ventilation-related energy compared to the mechanical system, while the hybrid system saved 24%. We also show that passive systems benefit greatly from maximum flow controllers that limit over-ventilation, and we provide guidance on the appropriate sizing of passive stacks.