FIG. 1 is a rear perspective view of a portable fan unit showing my new design in use in its intended environment;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof; and,

FIG. 6 is a right side elevational view with the left side being a mirror image thereof.

The broken line showing of a person in FIG. 1, is for illustrative purposes only, and forms no part of the claimed design.

The cross-hatch shading represents fabric and is understood to extend throughout the entire belt.