The ornamental design of a panel of an evaporativecooler, as shown and described.
FIG. 1 is a top, front, and right side perspective view of a panel of an evaporative cooler showing my new design;
FIG. 2 is an additional enlarged top, front, and right side perspective view thereof;
FIG. 3 is an enlarged front elevation view thereof;
FIG. 4 is an enlarged right side elevation view thereof;
FIG. 5 is an enlarged left side elevation view thereof; and,
FIG. 6 is an enlarged bottom plan view thereof.
The broken-line disclosure of the remainder of the evaporative cooler in FIG. 1 and the broken-line fragments of the remainder of the evaporative cooler in FIGS. 2–6 are shown for illustrative purposes only and form no part of the claimed design.