The ornamental design for a watermistingfan, as shown and described.
FIG. 1 is a first perspective view of the water misting fan showing our new design;
FIG. 2 is a second perspective view of the water misting fan;
FIG. 3 is a right side view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a front view thereof;
FIG. 6 is a rear view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom view thereof.
The broken lines immediately adjacent the shaded areas represent the bounds of the claimed design while all other broken lines are directed to unclaimed portions of the water misting fan; the broken lines form no part of the claimed design.