A filter system comprising: a housing comprising a tubesheet separating the housing into a dirty air chamber and a clean air chamber; a plurality of spacer elements attached to the tubesheet, wherein each spacer element of the plurality of spacer elements comprises a clean air inlet and a clean air outlet, and wherein the clean air inlet of each spacer element of the plurality of spacer elements is located in the dirty air chamber; a plurality of apertures in the tubesheet, wherein each spacer element of the plurality of spacer elements is positioned over an aperture of the plurality of apertures in the tubesheet such that air passing from the dirty air chamber into the clean air chamber through each spacer element of the plurality of spacer elements passes through the aperture, a plurality of filter elements, wherein each filter element of the plurality of filter elements is attached to the clean air inlet of one spacer element of the plurality of spacer elements; and a dirty air inlet (11; 111; 211) attached to the housing, wherein the dirty air inlet (11; 111; 211) is configured to deliver a dirty air stream into the dirty air chamber; wherein the housing comprises an upper wall panel and an end wall panel, and wherein a hopper, below the dirty air chamber, is configured to collect particulate matter separating from the dirty air stream, characterized in that - the end wall panel is located across the dirty air chamber from the tubesheet, - each spacer element of the plurality of spacer elements and the filter element attached to each spacer element extend across the dirty air chamber from the tubesheet to the end wall panel, and - the dirty air inlet (11; 111; 211) is attached to upper wall panel. a housing comprising a tubesheet separating the housing into a dirty air chamber and a clean air chamber; a plurality of spacer elements attached to the tubesheet, wherein each spacer element of the plurality of spacer elements comprises a clean air inlet and a clean air outlet, and wherein the clean air inlet of each spacer element of the plurality of spacer elements is located in the dirty air chamber; a plurality of apertures in the tubesheet, wherein each spacer element of the plurality of spacer elements is positioned over an aperture of the plurality of apertures in the tubesheet such that air passing from the dirty air chamber into the clean air chamber through each spacer element of the plurality of spacer elements passes through the aperture, a plurality of filter elements, wherein each filter element of the plurality of filter elements is attached to the clean air inlet of one spacer element of the plurality of spacer elements; and a dirty air inlet (11; 111; 211) attached to the housing, wherein the dirty air inlet (11; 111; 211) is configured to deliver a dirty air stream into the dirty air chamber; wherein the housing comprises an upper wall panel and an end wall panel, and wherein a hopper, below the dirty air chamber, is configured to collect particulate matter separating from the dirty air stream, characterized in that - the end wall panel is located across the dirty air chamber from the tubesheet, - each spacer element of the plurality of spacer elements and the filter element attached to each spacer element extend across the dirty air chamber from the tubesheet to the end wall panel, and - the dirty air inlet (11; 111; 211) is attached to upper wall panel. - the end wall panel is located across the dirty air chamber from the tubesheet, - each spacer element of the plurality of spacer elements and the filter element attached to each spacer element extend across the dirty air chamber from the tubesheet to the end wall panel, and - the dirty air inlet (11; 111; 211) is attached to upper wall panel.