According to the ventilation power classification: natural ventilation, mechanical ventilation;

According to the scope of ventilation services: comprehensive ventilation, local ventilation;

Classification according to the direction of airflow: sending (into), exhaust (smoke);

Classification according to the purpose of ventilation: general ventilation, hot air heating, detoxification dust removal, accident ventilation, protective ventilation, building smoke other;

Classified according to the location of power: power centralized power distributed.