The ornamental design for a ventilatingfan, as shown and described.
FIG. 1 is a front view of the ventilating fan;
FIG. 2 is a top view of the ventilating fan;
FIG. 3 is a bottom view of the ventilating fan;
FIG. 4 is a right side view of the ventilating fan;
FIG. 5 is a left side view of the ventilating fan;
FIG. 6 is a perspective view of the ventilating fan; and,
FIG. 7 is a scaled down perspective view of the ventilating fan, shown in a state of use installed on a housing depicted in broken lines.
The broken lines in FIGS. 1 through 7 depict parts of the ventilating fan and in FIG. 7, additional broken lines depict a housing; all broken lines form no part of the claimed design.