Fan

FIG. 1 is a perspective view of a fan showing my new design. FIG. 2 is a front view thereof. FIG. 3 is a rear view thereof. FIG. 4 is a left side view thereof. FIG. 5 is a right side view thereof. FIG. 6 is a top view thereof. FIG. 7 is a bottom view thereof. FIG. 8 is a rear, right, top perspective view thereof; and, FIG. 9 is an enlarged detail view of area 9 shown in FIG. 2 . The broken lines depict portions of the fan that form no part of the claimed design. In FIGS. 2 and 9 the broken lines denote the boundaries of the detail areas and form no part thereof.