Axial flow fan

FIG. 1 is a perspective view of axial flow fan in accordance with the present invention;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a right view thereof;

FIG. 5 is a left view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines illustrate portions of the axial flow fan that form no part of the claimed design.