The ornamental design for a portion of a ceilingfan housing, as shown and described.
FIG. 1 is a bottom perspective view of a portion of a ceiling fan housing in accordance with my design shown in use;
FIG. 2 is an enlarged side perspective view of the portion of a ceiling fan housing in accordance with my design;
FIG. 3 is an enlarged side elevation view of the portion of a ceiling fan housing in accordance with my design, the opposite view being a mirror image of that shown; and,
FIG. 4 is an enlarged bottom plan view of the portion of a ceiling fan housing in accordance with my design.
The broken line showing of the support rod, ceiling fan blades, blade irons, motor housing and attachment member is included for the purpose of illustrating environmental structure and forms no part of the claimed design.