Axial fans are classified based on various factors such as impeller design, mounting arrangement, and the direction of airflow.

Below are the commonly used classifications:

1. Impeller Design:

a. Axial Flow Fan: These fans have straight blades that move the air parallel to the fan axis. They are designed for high airflow at low pressure.

b. Mixed Flow Fan: These fans have a combination of axial and radial flow. The air is both accelerated axially and redirected radially by the impeller blades. They offer a balance between airflow and pressure.

2. Mounting Arrangement:

a. Ducted Axial Fan: These fans are typically installed inside a duct system. They are used for applications that require airflow in a specific direction or through a specific area.

b. Free-standing Axial Fan: These fans are stand-alone units that can be mounted on a wall or placed on the floor. They are commonly used in industrial settings and for ventilation purposes.

3. Direction of Airflow:

a. Axial Flow Fan: In this type, air flows parallel to the fan axis. The intake and exhaust are in the same direction.

b. Counterflow Fan: In this type, air is drawn in from one side and discharged from the opposite side. The airflow is opposite to the rotational direction of the fan impeller.

c. Reversible Axial Fan: These fans can change the direction of airflow based on the requirements. They are commonly used in applications where the airflow needs to be reversed periodically.

These are some of the common classifications of axial fans. The selection of the fan type depends on the specific requirements of the application, including desired airflow, pressure, and space limitations.