We claim the ornamental design for a shelf for refrigerator, as shown and described.
FIG. 1 is a front perspective view of a shelf for refrigerator showing our 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 the encircled portion in FIG. 1;
FIG. 9 is a partial cross-sectional view taken through line 9-9 of FIG. 2; and,
FIG. 10 is an enlarged view of the encircled portion in FIG. 7.
The broken lines in the figures depict environmental subject matter and form no part of the claimed design. The dot-dash broken lines and the dot-dot-dash broken lines encircling portions of the claimed design that are illustrated in enlargements form no part of the claimed design. The broken lines that have been included in the rectangular back portion of FIG. 3 represent boundary of the claim and form no part of the claimed design.