The ornamental design for a telescoping handle fan controller, as shown and described.
FIG. 1. is a top perspective view of a telescoping handle fan controller showing my new design in an opened position.
FIG. 2 is an enlarged top plan view showing my new design in a closed position.
FIG. 3 is an enlarged bottom plan view showing my new design in a closed position; and,
FIG. 4 is a side perspective view on a reduced scale showing my new design in an operating position.
The broken line showing of environmental structure in FIG. 4 is for illustrative purposes only and forms no part of the claimed design. The telescoping handle fan controller has been shown broken away to indicate indeterminate length.