The cabinet centrifugal fan is very alike in features to the cabinet-type centrifugal fan, incorporating all of the fan parts into a protective casing. The cabinet protects the fan from impurities and is also good for sound insulation. These fans are constructed for a variety of purposes, thus there are numerous sizes and capabilities of these fans. Air conditioners often include these types of fans because they serve as good circulation and ventilation support, assisting in the maintenance of a desirable indoor climate.