I claim the ornamental design for a ventilating fan hood, as shown and described.
FIG. 1 is a front bottom perspective view of a ventilating fan hood of the present invention;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a first side view thereof, the second side view being a mirror image thereof;
FIG. 5 is a top view thereof; and,
FIG. 6 is a bottom view thereof.
The broken line showing of the structural element in FIGS. 3 through 6 is included for the purpose of illustrating a portion of the ventilation fan hood that forms no part of the claimed design.