Room air cooler fans are typically of the axial type. Axial fans are designed to move air parallel to the fan's shaft. They consist of a set of blades that rotate around the axis of the fan, pulling air in from the back and pushing it out in the same direction.
In the context of room air coolers, axial fans are commonly used because they are efficient at moving large volumes of air at relatively low pressures. This makes them suitable for creating airflow through the cooling pads or wet media in the air cooler, helping to evaporate water and produce cooler air.
Centrifugal fans, on the other hand, are designed to move air radially, i.e., the airflow direction is perpendicular to the fan's shaft. They are better suited for higher pressure applications and are commonly used in HVAC systems and industrial applications where higher air resistance needs to be overcome.
In summary, room air cooler fans are typically axial fans due to their efficiency in moving air through the cooling system of the air cooler.