Vertical fan

[0001]FIG. 1 is a front, top and right-side perspective view of a vertical fan showing my new design;

[0002]FIG. 2 is a front view thereof;

[0003]FIG. 3 is a rear view thereof;

[0004]FIG. 4 is a top view thereof;

[0005]FIG. 5 is a bottom view thereof;

[0006]FIG. 6 is a right-side view thereof;

[0007]FIG. 7 is a left-side view thereof; and,

[0008]FIG. 8 is a rear, top and left-side perspective view thereof.

[0009]The broken lines shown represent portions of the vertical fan and form no part of the claimed design.