The ornamental design for a filterbankassembly, as shown and described.
FIG. 1 is a right side view of the filter bank assembly;
FIG. 2 is a perspective view of the front, top and right side thereof;
FIG. 3 is a perspective view of the rear, top and left side thereof;
FIG. 4 is another right side view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a front view thereof;
FIG. 7 is a rear view thereof;
FIG. 8 is a top planar view thereof; and,
FIG. 9 is a bottom planar view thereof.
The broken lines shown in the drawings are included for the purpose of illustrating environmental structure and portions of the article that form no part of the claimed design.