Cooling fan assembly for electric apparatus

A cooling fan assembly for an electronic apparatus, comprising:

• a casing having a sidewall and at least first and second air inlets and an air outlet, wherein:
• the sidewall comprises:
• two volute arches respectively corresponding to the first and second air inlets, each of the two volute arches comprising an arc inner surface and a flat inner surface having a tangent connection with the arc inner surface;
• and
• an arch interconnection connecting the arc inner surfaces of the two volute arches;
• and
• two flat inner surfaces of the sidewall are also two parts of an enclosure defining the air outlet;
• a first centrifugal fan received in the casing and positioned proximate the air outlet;
• and
• a second centrifugal fan received in the casing, the second centrifugal fan being juxtaposed with the first centrifugal fan and positioned proximate the air outlet, the first and second centrifugal fans being configured for creating an airflow through the casing, the first and second centrifugal fans and the casing further being configured such that the airflow is effectively induced to form a high-pressure volute tongue in a region bounded by the first and second centrifugal fans and the air outlet.