NOVELTY - An exhaust filter system for removing substances entrained in an exhaust gas from a nonroad engine having an exhaust outlet to discharge the exhaust gas, comprises filter casing having filter cavity; and filter core disposed in filter cavity and comprising tubular filtering loops where air pores are formed, tubular filtering spacers where air meshes are formed and defining air passages, and catalyzing element.    USE - For removing substances entrained in an exhaust gas from a nonroad engine.    ADVANTAGE - The exhaust filter system can remove harmful substances of exhaust gas from the nonroad engine. It provides an economic and efficient solution for filtering the harmful substances of exhaust gas from the generator, to minimize air pollution.    DETAILED DESCRIPTION - An exhaust filter system for removing substances entrained in an exhaust gas from a nonroad engine having an exhaust outlet to discharge the exhaust gas, comprises filter casing (30) having an intake opening for communicating with the exhaust outlet, discharging opening, and filter cavity (31) communicating the intake opening with the discharging opening for guiding the exhaust gas to flow from the intake opening to the discharging opening through the filter cavity; and filter core disposed in filter cavity and comprising tubular filtering loops coaxially received in the filter cavity, where air pores are formed for allowing the exhaust gas to pass through, tubular filtering spacers each between two filtering loops to define axial air passages between the filtering spacers and the filtering loops to communicate with the air pores, where air meshes are formed to communicate with the air passages, and catalyzing element on the filtering loops and filtering spacers for chemically reacting with the substances of the exhaust gas, thus when the exhaust gas passes through the air passages of the filter core, the exhaust gas is guided to evenly diffuse to the filter cavity through the air pores and the air meshes to enhance a chemical reaction of the exhaust gas with the catalyzing element.    DESCRIPTION OF DRAWING(S) - The figure is a perspective view of an exhaust filter system for a generator.    Outer shelter (20)    Air outlet (21)    Air inlet (22)    Filter casing (30)    Filter cavity (31)