A flange kit is supplied with each FN9280, FN9280E and FN9290 filters. FN9289, FN9289E and FN9299 filters are snap fit so they do not need flange kits. There is one Vertical (Top/Bottom) and one Horizontal (Left/Right) mounting frames. Each can be fitted in a way to make the filter rear or front mount. The frames snap into place easily. For rear mount options, 2 sets of self tapping screws and washers are supplied. Schaffner can supply the filters with flange frames fitted as standard. Part numbers are allocated for customers who wish to order filters with pre-assembled frames, i.e. FN9281, FN9282, FN9283, and FN9284.