The ornamental design for an extrusion for a buildingpanel, as shown and described.
FIG. 1 is a perspective view of an extrusion for a building panel showing our new design;
FIG. 2 is a left side elevation view of the extrusion shown in FIG. 1;
FIG. 3 is a front elevation view of the extrusion shown in FIG. 1;
FIG. 4 is a right side elevation view of the extrusion shown in FIG. 1;
FIG. 5 is a rear elevation view of the extrusion shown in FIG. 1;
FIG. 6 is a top plan view of the extrusion shown in FIG. 1; and,
FIG. 7 is a bottom plan view of the extrusion shown in FIG. 1.
The extrusion for a building panel is shown with a symbolic break in its length. The appearance of any portion of the article between the break lines forms no part of the claimed design.