When is forced ventilation always required?

Forced ventilation is always required in environments where natural airflow is insufficient to maintain air quality, such as in industrial settings with hazardous fumes, confined spaces, or areas with high heat generation. It is also essential in situations where specific temperature and humidity levels must be controlled, such as in laboratories or data centers. Additionally, forced ventilation is critical in buildings with high occupancy to ensure adequate oxygen levels and reduce the buildup of carbon dioxide and other pollutants.