Fan

FIG. 1 is a perspective view of a fan;

FIG. 2 is a front elevation view of the fan;

FIG. 3 is a left elevation view of the fan;

FIG. 4 is a right elevation view of the fan;

FIG. 5 is a top plan view of the fan;

FIG. 6 is a bottom plan view of the fan; and,

FIG. 7 is a rear elevation view of the fan.

Broken lines shown in the drawing views illustrate portions of the fan, and form no part of the claimed design.