multi-stage ventilation fan

Multi-stage ventilation fans feature two or more impeller stages mounted in series within a single housing. Each stage incrementally increases static pressure, enabling total pressures up to 10 kPa or more while maintaining high efficiency.

The staged impellers—backward-curved or radial blade—are dynamically balanced and encased in a reinforced volute. This design overcomes the limitations of single-stage fans in deep mines and extensive duct systems.

Driven by premium-efficiency IE4 motors and paired with VFDs, multi-stage fans provide precise pressure control and smooth startup. Thermal sensors and vibration monitors enhance reliability by alerting operators to stage imbalances or bearing issues.

Applications include deep-shaft ventilation, long tunnel airflow, and high-resistance industrial processes. Modular casing sections allow easy in-field assembly and maintenance, making multi-stage ventilation fans a versatile solution for challenging airflow requirements.