US Patent 7511955 Fan holder for receiving multiple fans

A fan holder for mounting fans includes a first plate having a plurality of airflow openings, and a second plate having a plurality of airflow openings aligned with the airflow openings of the first plate, thereby forming a plurality of rooms for mounting the fans between the first plate and the second plate, an airflow-blocking member has an engaging piece on an upside and a flange on an underside, the engaging piece and the flange of the airflow-blocking member engage on the first plate, thereby the airflow-blocking member is mounted on the first plate to close the airflow opening.