A fan includes a fan frame and an impeller. The fan frame has a housing, a base and at least one supporting element. The inner wall of the housing has at least one guiding portion for increasing an airflow intake of the fan, and the base is disposed within the housing and has a bottom portion and a pressurizing portion. The pressurizing portion is disposed around the bottom portion for increasing an air pressure of the fan. The supporting elements are connected to the housing and the pressurized portion of the base. The impeller is disposed within the housing and supported by the base.