Filter for a Vacuum Cleaner

FIG. 1 is a front perspective view of a filter for a vacuum cleaner showing our new design. FIG. 2 is a rear perspective view thereof. FIG. 3 is a front view thereof. FIG. 4 is a rear view thereof. FIG. 5 is a left side view thereof. FIG. 6 is a right side view thereof. FIG. 7 is a top view thereof, shown in enlarged scale; and, FIG. 8 is a bottom view thereof, shown in enlarged scale. The broken lines show portions of the design that form no part of the claimed design.