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.