FIG. 1 is a perspective view of an exhaust fan showing my new design;
FIG. 2 is a bottom view of the embodiment of FIG. 1;
FIG. 3 is a top view of the embodiment of FIG. 1;
FIG. 4 is a front view of the embodiment of FIG. 1;
FIG. 5 is a rear view of the embodiment of FIG. 1;
FIG. 6 is a side view of the embodiment of FIG. 1; and,
FIG. 7 is another side view of the embodiment of FIG. 1.
The ornamental design which is claimed is shown in solid lines in the drawings. The broken lines in the drawings illustrate portions of the exhaust fan and form no part of the claimed design. Broken lines formed of unequal length dashes (i.e., dash-dot) define bounds of the claimed design.