Patent ID: 8343247

Claim:
A filter module for removing air-polluting materials from a flow of machine exhaust, said filter module comprising: (a) a filter housing; (b) at least two parallel filter groups disposed within the filter housing, each such filter group having a longitudinal axis and a plurality of spaced-apart rod-shaped filter elements; (c) a center-to-center distance defined by-at least two or more spaced-apart rod-shaped filter elements of one of such filter groups; (d) at least two filter inserts, each said filter insert formed by the connection of at least two or more spaced-apart rod-shaped filter elements of one of said filter groups, said filter insert detachably coupling to the filter housing such as to allow exchanging of single filter inserts independently from other filter inserts; (e) wherein each of said filter groups are situated within the filter housing having the longitudinal axis crosswise to the direction of the flow of exhaust, and (f) wherein a first of said filter groups is arranged: (i) in front of a second of said filter groups relative to the direction of flow of exhaust so that the exhaust flows through a filter insert of said first filter group then through a filter insert of said second filter group, and (ii) offset longitudinally from a second of said filter groups by half of the center-to-center distance.