Moving filter device

摘要

There is provided a filter device with a housing having an air delivery fan (1), preferably a fan having an axial air inlet (6) and a radial air outlet (7). An axially rotating fan and filter unit is located between the air inlet and air outlet. The filter unit is comprised of at least one filter element (3) with a front face and a back face. Adjacent filter element front and back faces are mutually spaced over at least a portion of their entire width and/or length such that air can pass unimpeded in an air channel formed between the adjacent front and back faces. Adjacent filter element front and back faces are preferably on different filter elements (4). Preferably, multiple filter elements are spaced in the radial direction around the axis of rotation and in the direction of rotation are mutually parallel. The fan and filter units are also provided with air moving means which can be air moving elements and/or air filter elements. The air moving elements are also preferably spaced in the radial direction around the axis of rotation and in the direction of rotation are mutually parallel. The optional air moving means establish the airflow with a general airflow direction at a given pressure head and volumetric flowrate. With the preferred centrifugal type radial fan the air is drawn in axially with the fan and filter unit axis of rotation and discharged radially outward. The air moving elements and/or filter elements are spaced from adjacent air moving elements and/or filter elements to allow the unimpeded passage of air between the air moving elements and/or filter elements. The air filter elements comprise an electret charged filter media.