A centrifugal fan includes a spiral-shaped housing with a driving mechanism and multiple internally mounted centrifugal impellers. The driving mechanism is mounted on a circular base. At least two support brackets links the circular base to the spiral-shaped housing, wherein profiles of the support brackets are involute curves based upon the circular base. The multiple centrifugal impellers, driven by the driving mechanism, suck airflow into the spiral-shaped housing through void spaces among the support brackets. The centrifugal impellers are perpendicular to the support bracket profiles.