The ornamental design for a vent panel, as shown and described.
FIG. 1 is a plan view of a vent panel, showing my new design;
FIG. 2 is a detailed view of a portion of the vent panel shown in FIG. 1; and,
FIG. 3 is a detailed view of the vent panel shown in FIG. 1.
In the drawings, the broken lines depict environmental subject matter only for illustrative purposes and form no part of the claimed design. For example, the broken lines in FIG. 2 indicate that a specific number of holes forms no part of the claimed design. The broken lines in FIG. 1 indicate that a specific length and width of a vent panel also form no part of the claimed design as the shape may be repeated in a pattern throughout a length and/or width of a vent panel. The claimed design is primarily the vent panel having one or more holes with the generally heart shaped configuration as shown in FIG. 1.