Patent ID: 8025490

Claim:
A connection frame, used in a serial fan assembly comprising an upstream fan and a downstream fan, wherein the cross-section of an outlet of the upstream fan and the cross-section of an inlet of the downstream fan have different sizes and the connection frame comprises a single housing formed with an air guiding passage and a chamber, the air guiding passage having a first surface and a second surface, wherein a first frame of the upstream fan or a second frame of the downstream fan is accommodated in the chamber, the first surface is connected with the outlet of the upstream fan, and the second surface is connected with the inlet of the downstream fan so that the upstream fan and the downstream fan are arranged in series, wherein the first surface and the second surface have different sizes; and, wherein the connection frame further comprises a base and a plurality of ribs for connecting the base and the single housing, and the base and the ribs are accommodated in the air guiding passage.