Ventilating Fan

FIG. 1 is a first top perspective view of a ventilating fan showing my new design; FIG. 2 is a second top perspective view thereof; FIG. 3 is a front view thereof; FIG. 4 is a rear view thereof; FIG. 5 is a first side view thereof; FIG. 6 is a second side view thereof; FIG. 7 is a top view thereof; FIG. 8 is a bottom view thereof; and, FIG. 9 is a cross-sectional view thereof taken along line 9 - 9 of FIG. 7 . The broken lines in the drawings illustrate portions of the ventilating fan which form no part of the claimed design.