Ventilating Fan

FIG. 1 is a perspective front view of a ventilating fan, FIG. 2 is a top view thereof, FIG. 3 is a bottom view thereof, FIG. 4 is a rear view thereof, FIG. 5 is a front view thereof, FIG. 6 is a right side view, with respect to FIG. 2 , FIG. 7 is a left side view, with respect to FIG. 2 ; and, FIG. 8 is a perspective bottom view thereof. Any broken lines in the figures illustrate portions of the ventilating fan that form no part of the claimed design.