FIG. 1 is a front perspective view of a grill for a window fan, showing my new design.

FIG. 2 is a top plan view thereof, the bottom view being identical thereto.

FIG. 3 is a front view of the window fan; and,

FIG. 4 is a side plan view thereof, the opposite side veiw being identical thereto.

The broken-line showing of environmental structure in FIGS. 1-4 is for illustrative purposes only end forms no part of the claimed design.