Ventilation Fan

FIG. 1 is a perspective view of a ventilation fan showing my new design;

FIG. 2 is another perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a back view thereof;

FIG. 5 is a left view thereof;

FIG. 6 is a right view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is bottom plan view thereof.

The broken lines showing of the ventilation fan are for the purpose of illustrating article and form no part of the claimed design.