Fan

FIG. 1 is a top perspective view of a fan, showing my new design; FIG. 2 is a bottom perspective view thereof; FIG. 3 is a front view thereof; FIG. 4 is a rear view thereof; FIG. 5 is a left side view thereof; FIG. 6 is a right side view thereof; FIG. 7 is a top view thereof; FIG. 8 is a bottom view thereof; FIG. 9 is a top perspective view thereof showing the fan in a state of use; FIG. 10 is a top perspective view thereof showing the fan in another state of use; FIG. 11 is a top perspective view thereof showing the fan in yet another state of use; FIG. 12 is an enlarged detail view of area 12 in FIG. 1 ; FIG. 13 is an enlarged detail view of area 13 in FIG. 3 ; and, FIG. 14 is an enlarged detail view of area 14 in FIG. 4 . The broken lines in the drawings illustrate the portions of the fan, which form no part of the claimed design. The dash-dot-dash broken lines encircling the enlarged views are for annotative purposes only and form no part of the claim thereof.