1.Motor drive: The fan is driven by a motor, the power of which is transmitted to the impeller of the fan through the shaft.

2. Impeller rotation: The rotation of the impeller generates centrifugal force, which causes air to be drawn in through the air inlet.

3. Air intake: The rotating impeller generates negative pressure, which draws air in from the air inlet.

4. Air Acceleration: The air gains kinetic energy through the rotating impeller and its speed increases.

5. Pressure change: The centrifugal force generated by the rotating impeller increases the air pressure, thus pushing the air to flow.

6. Expelled airflow: The accelerated air is discharged through the exhaust port, creating a continuous airflow.

A forced ventilation fan is usually used in situations where a strong airflow is required to ensure effective air flow and ventilation. It plays a key role in the following applications.

1. Industrial use: for ventilation and exhaust in factories to improve air quality.

2. Boiler and combustion systems: Provide sufficient oxygen to improve combustion efficiency.

3. HVAC systems: Used in buildings for air circulation and temperature control.

4. Tunnels and underground works: Provide fresh air and exhaust harmful gases to ensure safety.

5. Cooling systems: help dissipate heat from equipment, such as cooling towers.

6. Mine ventilation: Ensure air circulation in mines and expel harmful gases.

Overall, forced ventilation fans mechanically generate airflow to circulate and ventilate the air, thus improving indoor air quality and environmental comfort.