A filter module , especially for gas filtration purposes, the filter module comprising two or more block-shaped units arranged in parallel and connected to one another at their side faces, each unit comprising a plurality of filter elements having a longitudinal, porous tubular wall part having an open first end serving as a raw gas inlet and a closed second end , wherein said filter elements are arranged coextensive and in parallel orientation with their tubular wall parts , their open ends being all located on one side of the filter module serving as a feed side thereof, and a plurality of clean gas ducts which are substantially coextensive with, oriented parallel to, and regularly interposed between the filter elements , the clean gas ducts being open at one end forming a clean gas outlet and closed at their opposite end , whereas the closed ends of the clean gas ducts being located at the feed side of the filter module , and whereas their open ends are located adjacent to a discharge side of the filter module opposite to the feed side of the filter module ; wherein said open ends of the filter elements and said closed ends of the clean gas ducts form a feed side surface of a block-shaped unit , and wherein said open ends of the clean gas ducts and said closed ends of the filter elements form a discharge side surface of a block-shaped unit ; wherein the tubular wall parts of the filter elements have a cross-sectional area corresponding to the area of a square with an edge length of 3 to 20 mm; and wherein the length of the tubular wall parts of the filter elements amounts to 30 to 200 mm; said filter module further comprising at the discharge side a clean gas collecting and discharge arrangement extending across all of the clean gas outlets of the clean gas ducts of the one or more units and providing a clean gas discharge opening for the filter module , said clean gas collecting and discharge arrangement comprising one or more clean gas channels in fluid communication with said clean gas outlets of the clean gas ducts deflecting and directing the clean gas flow from the open ends of the clean gas ducts in a direction transverse to the vertical of the discharge side surface, and wherein the one or more channels of the clean gas collecting and discharge arrangement have a height, measured as the clearance in the direction of the vertical of the discharge side surface of the block-shaped unit(s) , in the range of from 0.3 to 0.5 times the length of the tubular wall parts of the filter elements . a plurality of filter elements having a longitudinal, porous tubular wall part having an open first end serving as a raw gas inlet and a closed second end , wherein said filter elements are arranged coextensive and in parallel orientation with their tubular wall parts , their open ends being all located on one side of the filter module serving as a feed side thereof, and a plurality of clean gas ducts which are substantially coextensive with, oriented parallel to, and regularly interposed between the filter elements , the clean gas ducts being open at one end forming a clean gas outlet and closed at their opposite end , whereas the closed ends of the clean gas ducts being located at the feed side of the filter module , and whereas their open ends are located adjacent to a discharge side of the filter module opposite to the feed side of the filter module ; wherein said open ends of the filter elements and said closed ends of the clean gas ducts form a feed side surface of a block-shaped unit , and wherein said open ends of the clean gas ducts and said closed ends of the filter elements form a discharge side surface of a block-shaped unit ; wherein the tubular wall parts of the filter elements have a cross-sectional area corresponding to the area of a square with an edge length of 3 to 20 mm; and wherein the length of the tubular wall parts of the filter elements amounts to 30 to 200 mm; <EOS>