The ornamental design for a ceiling fan housing, as shown and described.
FIG. 1 is a perspective view from below of the ceiling fan housing in accordance with my design.
FIG. 2 is a side elevation view of the ceiling fan housing in accordance with my design;
FIG. 3 is a bottom plan view of the ceiling fan housing in accordance with my design; and,
FIG. 4 is a top plan view of the ceiling fan housing in accordance with my design.
The broken line showing of environmental structure in FIGS. 1-4 is for illustrative purposes only and forms no part of the claimed design. The front, back, left and right sides are identical except for position of the fan blades.