FIG. 1 is a right side perspective view, front to rear, of a filter housing showing my new design. FIG. 2 is a right side perspective view, rear to front, thereof; FIG. 3 is a right side planar perspective view thereof; FIG. 4 is a left side view thereof; FIG. 5 is a right side view thereof; FIG. 6 is a front view thereof; FIG. 7 is a rear view thereof; FIG. 8 is a top view thereof; and, FIG. 9 is a bottom view thereof.