Moving filter device having filter elements with flow passages and method of filtering air

摘要

There is provided an air delivery device and method of moving and filtering air. The air delivery device comprises a housing having an air inlet and an air outlet. Between the air inlet and the air outlet is located an air delivery fan having at least two rotating air moving elements, the rotating air moving elements intersects the flow of air between the air inlet and the air outlet and establishes a higher pressure zone at the air outlet relative to the air inlet. The air delivery fan further comprises at lest one filter element, having at least one upstream filter face and at least one downstream filter face, defining at least one primary flow channel, and rotating along the same axis of rotation as the air moving elements and preferably forming the air moving elements at least in part. The upstream filter face moves into a portion of the airflow through the air delivery fan such that the upstream filter face impacts a portion of the moving airflow in a flow channel, permitting the air to flow through the filter element into the airflow of an further flow channel. The filter elements further define air flow passages or inlets allowing substantially unimpeded airflow to the primary flow channels and out to the air outlet. The air filter elements comprise an electret charged filter media.