Centrifugal fan

FIG. 1 is a front elevation view of a centrifugal fan embodying our design, shown in an environment of use;

FIG. 2 is a rear elevation view thereof;

FIG. 3 is a right side elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a cross-sectional view thereof, taken along line 7 - 7 of FIG. 4 ;

FIG. 8 is a cross-sectional view thereof, taken along line 8 - 8 of FIG. 4 ;

FIG. 9 is a cross-sectional view thereof, taken along line 9 - 9 of FIG. 4 ;

FIG. 10 is a perspective view thereof;

FIG. 11 is a front elevation view thereof, shown at an enlarged scale and with the environment removed;

FIG. 12 is a rear elevation view thereof;

FIG. 13 is a right side elevation view thereof;

FIG. 14 is a left side elevation view thereof;

FIG. 15 is a top plan view thereof; and,

FIG. 16 is a bottom plan view thereof.

The evenly-spaced broken lines depict environmental subject matter only and form no part of the claimed design. The unevenly-spaced broken lines show the boundaries of the claimed design only and form no part of the claimed design.