What is the most commonly used type of fan in residential HVAC systems?

The most commonly used type of fan in residential HVAC systems is the forward curve centrifugal fan. This type of fan is favored because of its ability to move a large volume of air at relatively low pressures, making it ideal for the air distribution needs in residential settings.

The forward curve design features blades that curve in the same direction as the rotation of the wheel, which allows for higher airflow and greater efficiency in moving air through ductwork. This efficiency is crucial for maintaining comfortable indoor environments, particularly in heating and cooling applications. Additionally, forward curve fans tend to operate quietly, which is a significant consideration for residential applications where noise can be a concern.

While axial fans and propeller fans are also used in various applications, they are typically more suited for situations requiring high airflow with lower pressure. Backward curve centrifugal fans, on the other hand, are commonly found in industrial and commercial systems due to their efficiency at higher pressures but are less common in residential HVAC systems compared to forward curve fans.