FIG. 1 is a front, right side, top perspective view of portable fan showing my new design;
FIG. 2 is a rear, left side, bottom perspective view thereof;
FIG. 3 is a front elevational view;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a right side elevational view thereof;
FIG. 7 is a top plan view thereof;
FIG. 8 is a bottom plan view thereof;
FIG. 9 is a front, right side, perspective view thereof with the base of the portable fan in an outward folded stand state;
FIG. 10 is a front, right side perspective view thereof with the portable fan shown in a partially folded state; and,
FIG. 11 is a front, right side, perspective view thereof showing the portable fan in its entirely closed state.
The broken lines immediately adjacent to the claimed portions are boundaries, all other broken lines are environmental structures; all the broken lines form no part of the claimed design.