Abstract: A cover is provided for an air filter that is used in automobile applications. The cover is adapted to generally fit over an air filter that has a cylindrical shape with filtering material on its top and vertical sides. The cover has a hole about its center axis that is sized to receive a screw provided on the top side of the air filter. The cover may be provided with one or more bearing mechanisms along its center to allow the cover to spin about its center axis. The cover has openings so that air may pass through the openings and into the top side of the air filter. The openings may have angled cuts, like a blade of a propeller, so that as air passes through the openings, the angle cuts cause the cover to spin relative to the air filter without inhibiting flow of air to the air filter.