What are the two main classifications of fans commonly used in ventilation systems?

The two main classifications of fans commonly used in ventilation systems are axial and centrifugal.

Axial fans are designed to move air parallel to the fan's axis. They are typically used in applications requiring high airflow rates and lower pressure increases, making them ideal for general ventilation and cooling. The design allows for efficient movement of air over long distances in relatively low-pressure scenarios.

Centrifugal fans, on the other hand, operate by drawing air into the center of the fan and then expelling it at a 90-degree angle through a discharge outlet. This design allows for higher pressure increases, making centrifugal fans more suitable for systems that require significant airflow resistance, such as ducted systems or situations where air needs to be moved against high static pressures.

Both types of fans play crucial roles in maintaining effective ventilation in various environments, ensuring proper air exchange and temperature regulation. Understanding the difference between axial and centrifugal fans is essential for selecting the appropriate type for specific ventilation requirements.