The ornamental design for a towerfan with an upper holder, as shown and described.
FIG. 1 is a left front side perspective view of a tower fan with an upper holder.
FIG. 2 is a right front perspective view of the novel floor fan tower design of FIG. 1.
FIG. 3 is a left rear perspective view of the novel floor fan tower design of FIG. 1.
FIG. 4 is a right rear perspective view of the novel floor fan tower design of FIG. 1.
FIG. 5 is a front view of the novel floor fan tower design of FIG. 1.
FIG. 6 is a right side view of the novel floor fan tower design of FIG. 1.
FIG. 7 is a left side view of the novel floor fan tower design of FIG. 1.
FIG. 8 is a rear view of the novel floor fan tower design of FIG. 1.
FIG. 9 is an enlarged upper front right view of the novel floor fan tower design of FIG. 1.
FIG. 10 is an enlarged upper front view of the novel floor fan tower design of FIG. 1.
FIG. 11 is an enlarged fragmentary top view of the novel floor fan tower design of FIG. 1; and,
FIG. 12 is an enlarged fragmentary bottom view of the novel floor fan tower design of FIG. 1.
The broken line showing of the side seams, the bottom the stand and the flower vase with flowers is included for the purpose of illustrating environmental structure and forms no part of the claimed design.