A housing includes a major component. The major component has a planar section. The planar section has an aperture constituting an inlet. The major component has a generally cylindrical peripheral section. A tangential extension is provided. The aperture constitutes an outlet. The housing also includes a minor component. The minor component has a planar section. The planar section has an aperture. The aperture constitutes an outlet. A tangential extension is adapted to overlie the major component for creating a chamber. A rotatable assembly includes an annular plate. The annular plate has an aperture. Spaced impeller segments are provided. A propeller is also provided. The propeller has an axial bore. Propeller blades are provided. Openings are provided between the blades. The bore is adapted to receive a drive shaft of a motor. In this manner the propeller and the annular plate and the impeller segments are rotated.