The ornamental design for a body for a portablefan, as shown and described.
FIG. 1 is a right side front perspective view of a body for a portable fan showing my new design;
FIG. 2 is a right side rear perspective view thereof;
FIG. 3 is a front elevation view thereof;
FIG. 4 is a right side elevation view thereof;
FIG. 5 is a left side elevation view thereof;
FIG. 6 is a rear elevation view thereof; and,
FIG. 7 is an enlarged top plan view thereof.
The broken line showing of the front grill, side grills, top buttons and bottom stand is included for the purpose of illustrating environmental structure and forms no part of the claimed design.