Axial fan with double impellers rotating in mutually opposite directions

FIG. 1 is a front elevation view.

FIG. 2 is a rear elevation view.

FIG. 3 is a right side elevation view.

FIG. 4 is a left side elevation view.

FIG. 5 is a top plan view.

FIG. 6 is a bottom plan view.

FIG. 7 is a cross sectional view as taken along 7 — 7 line in FIG. 4 , omitting the lead wires.

FIG. 8 is an enlarged cross sectional view as taken along 8 — 8 line in FIG. 1 ; and,

FIG. 9 is a perspective view for reference, omitting the lead wires.

Note that the present ornamental design for which patent protection is sought is shown in solid lines, while the portions shown in dashed lines are environmental features forming no part of the present design.