Patent ID: 7628845

Claim:
A filtering device used for filtering a gas, wherein the gas has a first temperature, the filtering device comprises: a casing having an input opening, an output opening and a cooling space, wherein the gas enters the cooling space through the input opening and leaves the cooling space through the output opening; a cooling mechanism coupled to the casing for maintaining the temperature inside the cooling space at a second temperature, which is lower than the first temperature; and a plurality of adsorbing elements disposed inside the cooling space and including a plurality of surface-increasing elements arranged in a direction parallel to the direction that the gas flows inside the cooling space for absorbing particles in the gas by cooling down the particles which are contacted by a plurality of walls of the adsorbing elements; wherein each of the adsorbing elements has a bottom surface, a top surface and a via hole, the via hole passes through the bottom surface and the top surface, and all of the plurality of surface-increasing elements are arranged on a lateral surface of the via hole.