FIG. 1 is a left end view, showing the cavity wall barrier in a first position. In the first position, the right end view is identical;
FIG. 2 is a left end view, showing the cavity wall barrier in a second position. In the second position, the right end view is identical;
FIG. 3 is a right side view, showing the cavity wall barrier in the second position. In the second position, the left side view is identical;
FIG. 4 is a left end view, showing the cavity wall barrier in a third position. In the third position, the right end view is identical;
FIG. 5 is a left end view, showing the cavity wall barrier in a fourth position. In the fourth position, the right end view is identical;
FIG. 6 is a top view, showing the cavity wall barrier in the fourth position; and,
FIG. 7 is a bottom view, showing the cavity wall barrier in the fourth position with the lower wings partially cut away to reveal the upper wings which lie on top of them.
The broken lines in the drawings illustrate portions of a cavity wall barrier which form no part of the claimed design. The cavity wall barrier 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. The article is shown at a larger scale in FIGS. 1, 2, 4 and 5 than in FIGS. 3, 6 and 7.