a single filter over the motor intake, washable by the looks of it so if it lasts a year or more, buy another and geaorge will stay healthy . I might wack a collection bag over the outlet as well to make it last longer, use a henry one.
used mine today on a rayburn, suction ok, but the nozzle is a bit big, aluminium, so gave it a once over with my hammer and now it is slimmed down and reaches in better