The ornamental design for a shelf for refrigerator, as shown and described.
FIG. 1 is a top perspective view of a shelf for refrigerator showing our new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a left side elevation view thereof;
FIG. 5 is a right side elevation view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof;
FIG. 8 is a top perspective view thereof, in an alternative configuration;
FIG. 9 is an enlarged view of the portion encircled in FIG. 1;
FIG. 10 is an enlarged view of the portion encircled in FIG. 2;
FIG. 11 is an enlarged view of the portion encircled in FIG. 3; and,
FIG. 12 is a top perspective view thereof, showing an example refrigerator in dashed broken lines for environmental purposes.
The dashed broken lines in the drawings illustrate example environment and portions of the shelf that form no part of the claimed design.
The dot-dash broken lines in the drawings encircle portions of the claimed design that are illustrated in enlargements and form no part of the claimed design.