Ventilating Fan

FIG. 1 is a top, front and right side perspective view of a ventilating fan showing my new design; FIG. 2 is a bottom, rear and left side perspective view thereof; FIG. 3 is a front elevational view thereof; FIG. 4 is a rear elevational view thereof; FIG. 5 is a left side view thereof; FIG. 6 is a right side view thereof; FIG. 7 is a top plan view thereof; FIG. 8 is a bottom plan view thereof; FIG. 9 is an enlarged view of portion 9 in FIG. 1 ; FIG. 10 is an enlarged view of portion 10 in FIG. 1 ; and, FIG. 11 is an enlarged view of portion 11 in FIG. 2 . The evenly dashed broken lines in the drawings illustrate portions of the ventilating fan that form no part of the claimed design. The unevenly dashed broken lines illustrate the boundary of the enlarged views and form no part of the claimed design.