The ornamental design for a fanhousing, as shown and described.
FIG. 1 is a perspective view of a first, rounded-bottom-edge embodiment of the invention, with interior fan blades omitted for ease of illustration;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a view looking from the right side of FIG. 1;
FIG. 5 is a view looking from the left side of FIG. 1;
FIG. 6 is a top view; and,
FIG. 7 is a bottom view.
The broken line showing of the attachment member and other portions is included for the purpose of illustrating environmental structure and forms no part of the claimed design.