Air fan for suction of dust and waste

摘要

The fan for sucking up dust or waste has a settling chamber (7) for solids and liquids. The fan is selectively joined to this chamber so as to blow into it or suck from it. The chamber has two access pipes (14,15), one acting as an inlet for suction when the other is closed and the second as an inlet for blowing into when the first is closed. Within the settling chamber projects a preliminary filter chamber (12). The first access pipe goes to this chamber and the second goes directly to the settling chamber. The fan is connected so that in suction operation air is sucked through the filter into the settling chamber.