FIG. 1 is a front perspective view of the fan filter.
FIG. 2 us a rear perspective view of the fan filter.
FIG. 3 is a side elevational view of the fan filter, the opposite side being a mirror image of that shown; and,
FIG. 4 a perspective view of the fan filter removed from the fan.
The broken line showing of environmental structure in FIGS. 1-3 is for illustrative purposes only and forms no part of the claimed design.
The ornamental design for the “fan filter”, as shown and described.