The ornamental design for a pan rack, as shown and described.
FIG. 1 is a perspective view of a pan rack showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof;
FIG. 8 is an enlarged view of an indicated portion of FIG. 1; and,
FIG. 9 is another perspective view thereof with additional frames.
The broken line portions of the pan rack in FIGS. 1-9 represent unclaimed portions of the claimed design and form no part thereof. The broken lines of the additional frames in FIG. 9 illustrate unclaimed environment and form no part of the claimed design. The dot-dash broken lines in FIGS. 1-5 and 8-9 represent unclaimed boundary lines and form no part of the claimed design.