FIG. 1 shows a three-quarter front perspective view of the ornamental design of small electric fan;

FIG. 2 shows a three-quarter rear perspective view of the ornamental design of an electric fan, with the rear support leg in open condition;

FIG. 3 shows a full front view of the ornamental design of the fan;

FIG. 4 shows a right side view of the ornamental design of the fan, with the rear support leg in closed condition;

FIG. 5 shows a left side view of FIG. 4;

FIG. 6 shows a full rear view of FIG. 4;

FIG. 7 shows a top view of FIG. 4; and,

FIG. 8 shows a bottom view of FIG. 4.