US D471972 S1
FIG. 1 is a perspective view showing my new design for an extension for a heating duct;
FIG. 2 is a left side elevation view which is a mirror image of the right side elevation view;
FIG. 3 is a bottom plan view;
FIG. 4 is a front elevation view which is a mirror image of the rear elevation view; and,
FIG. 5 is a top plan view.